Stainless steel flanges ASME B16.5-2013

Class 150 / 300 / 600 / 900 / 1500 / 2500

The ASME B16.5 standard sets specifications on circular flanges made of Class 150 and Class 2500 steel and with nominal dimensions NPS ½ to 24.

It defines the types of flanges and their joint sizes, dimensions, tolerances, threads, bolt dimensions, conditions of joint faces of the flanges, marking, materials and relationships between pressure and temperature.

Type 01
Type 05
Type 11
Type 12
Type 13
Type 14
Type 15
Type 21

Type 01 - Flat-face flange to be welded

Type 05 - Blind flange

Type 11 - Flange with butt-weld neck

Type-11-Bride-a-collerette-a-souder-bout-a-bout

Type 12 - Slip-on and weld neck flange

Type-12-Bride-a-emmancher-et-a-souder-a-collerette

Type 13 - Threaded flange with neck

Type 14 - Socket weld and weld neck flange

Type-14-Bride-a-emboiter-et-a-souder-a-collerette

Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Type 21 - Integral flange

Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500

Class 150 Flange - DN 15 to 600 - ASME B16.5

Type 01

Class 150 Flange - Type 01 - Flat-face flange to be welded

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of bore
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of bore
NPS	DN	D	K	L			C1	B1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	12,0	22,4
3/4	20	98	69,8	5/8 (15,9)	4	1/2	14,0	27,7
1	25	108	79,4	5/8 (15,9)	4	1/2	16,0	34,5
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	18,0	43,2
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	19,0	49,5
2	50	152	120,6	3/4 (19,0)	4	5/8	21,0	62,0
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	24,0	74,7
3	80	190	152,4	3/4 (19,0)	4	5/8	26,0	90,7
4	100	229	190,5	3/4 (19,0)	8	5/8	27,0	116,1
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	28,0	143,8
6	150	279	241,3	7/8 (22,2)	8	3/4	31,0	170,7
8	200	343	298,4	7/8 (22,2)	8	3/4	34,0	221.5
10	250	406	362,0	1 (25,4)	12	7/8	38,0	276,4
12	300	483	431,8	1 (25,4)	12	7/8	42,0	327,2
14	350	533	476,2	1 1/8 (28,6)	12	1	43,0	359,2
16	400	597	539,8	1 1/8 (28,6)	16	1	48,0	410,5
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	56,0	461,8
20	500	698	635,0	1 1/4(31,8)	20	1 1/8	59,0	513,1
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	62,0	616,0
a) It is useful to avoid using these dimensions in new constructions.

Type 5

Class 150 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C2	G
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	-
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	-
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	-
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	-
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	-
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	-
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	38
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	51
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	76
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	102
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	127
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	200
10	250	406	362,0	1 (25,4)	12	7/8	30,2	225
12	300	483	431,8	1 (25,4)	12	7/8	31,8	279
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	311
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	362
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	39,7	413
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	463
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	565
a) It is useful to avoid using these dimensions in new constructions.

Type 11

Class 150 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C2	N	A	H3	B3	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	21,3	47,6	15,8	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	38	26,7	52,4	20,8	3
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	49	33,4	55,6	26,7	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	59	42,2	57,2	35,1	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	65	48,3	61,9	40,9	3
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	78	60,3	63,5	52,6	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	90	73,0	69,9	62,7	3
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	108	88,9	69,9	78,0	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	114,3	76,2	102,4	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	141,3	88,9	128,3	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	168,3	88,9	154,2	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	219,1	101,6	202,7	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	273,0	101,6	254,5	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	323,9	114,3	304,8	9,5
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	400	355,6	127,0	To be specified by the buyer	9,5
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	457	406,4	127,0		9,5
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	39,7	505	457,2	139,7		9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	508,0	144,5		9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	609,6	152,4		9,5
a) It is useful to avoid using these dimensions in new constructions.

Type 12

Class 150 Flange - Type 12 - Slip-on and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C2	N	H1	B1	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	15,9	22,4	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	38	15,9	27,7	3
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	49	17,5	34,5	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	59	20,6	43,2	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	65	22,2	49,5	3
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	78	25,4	62,0	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	90	28,6	74,7	3
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	108	30,2	90,7	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	33,3	116,1	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	36,5	143,8	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	39,7	170,7	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	44,5	221.5	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	49,2	276,4	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	55,6	327,2	9,5
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	400	57,2	359,2	9,5
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	457	63,5	410,5	9,5
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	39,7	505	68,3	461,8	9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	73,0	513,1	9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	82,6	616,0	9,5
a) It is useful to avoid using these dimensions in new constructions.

Type 13

Class 150 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Joint radius of the neck (min.)
NPS	DN	D	K	L			C2	N	H1	T	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	15,9	15,9	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	38	15,9	15,9	3
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	49	17,5	17,5	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	59	20,6	20,6	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	65	22,2	22,2	3
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	78	25,4	25,4	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	90	28,6	28,6	3
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	108	30,2	30,2	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	33,3	33,3	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	36,5	36,5	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	39,7	39,7	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	44,5	-	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	49,2	-	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	55,6	-	9,5
14	350	533	476,2	11/8 (28,6)	12	1	34,9	400	57,2	-	9,5
16	400	597	539,8	11/8 (28,6)	16	1	36,5	457	63,5	-	9,5
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	39,7	505	68,3	-	9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	73,0	-	9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	82,6	-	9,5
a) It is useful to avoid using these dimensions in new constructions.

Type 14

Class 150 Flange - Type 14 - Socket weld and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore		Depth of the socket weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Slip-on, socket weld and weld-on plate	with neck to be butt-welded	Depth of the socket weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C2	N	H1	B1	B3	U	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	15,9	22,4	15,8	9,5	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	38	15,9	27,7	20,8	11,0	3
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	49	17,5	34,5	26,7	12,5	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	59	20,6	43,2	35,1	14,5	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	65	22,2	49,5	40,9	16,0	3
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	78	25,4	62,0	52,6	17,5	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	90	28,6	74,7	62,7	19,0	3
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	108	30,2	90,7	78,0	20,5	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	33,3	116,1	102,4	-	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	36,5	143,8	128,3	-	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	39,7	170,7	154,2	-	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	44,5	221.5	202,7	-	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	49,2	276,4	254,5	-	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	55,6	327,2	304,8	-	9,5
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	400	57,2	359,2	To be specified by the buyer	-	9,5
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	457	63,5	410,5		-	9,5
18	450	635	577,8	1 1/4(31,8)	16	1 1/8	39,7	505	68,3	461,8		-	9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	73,0	513,1		-	9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	82,6	616,0		-	9,5
a) It is useful to avoid using these dimensions in new constructions.

Type 15

Class 150 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C2	N	H2	B2	r	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	15,9	23,0	3,0	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	12,7	38	15,9	28,0	3,0	3
1	25	108	79,4	5/8 (15,9)	4	1/2	14,3	49	17,5	35,0	3,0	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	15,9	59	20,6	43,5	5,0	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	17,5	65	22,2	50,0	6,5	3
2	50	152	120,6	3/4 (19,0)	4	5/8	19,0	78	25,4	62,5	8,0	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	22,2	90	28,6	75,5	8,0	3
3	80	190	152,4	3/4 (19,0)	4	5/8	23,8	108	30,2	91,5	9,5	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	33,3	117,0	11,0	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	36,5	145,0	11,0	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	39,7	171,0	12,5	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	44,5	222,0	12,5	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	49,2	277,0	12,5	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	55,6	328,0	12,5	9,5
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	400	79,4	360,0	12,5	9,5
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	457	87,3	411,0	12,5	9,5
18	450	635	577,8	1 1/4 (31,8)	16	1 1/8	39,7	505	96,8	462,0	12,5	9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	103,2	514,0	12,5	9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	111,1	616.0	12,5	9,5
a) It is useful to avoid using these dimensions in new constructions.

Type 21

Class 150 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C3	N	A	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm
1/2	15	89	60,3	5/8 (15,9)	4	1/2	11,1	30	21,3	3
3/4	20	98	69,8	5/8 (15,9)	4	1/2	11,1	38	26,7	3
1	25	108	79,4	5/8 (15,9)	4	1/2	11,1	49	33,4	3
1 1/4 a)	32	117	88,9	5/8 (15,9)	4	1/2	12,7	59	42,2	3
1 1/2	40	127	98,4	5/8 (15,9)	4	1/2	14,3	65	48,3	3
2	50	152	120,6	3/4 (19,0)	4	5/8	15,9	78	60,3	3
2 1/2 a)	65	178	139,7	3/4 (19,0)	4	5/8	17,5	90	73,0	3
3	80	190	152,4	3/4 (19,0)	4	5/8	19,0	108	88,9	3
4	100	229	190,5	3/4 (19,0)	8	5/8	23,8	135	114,3	3
5 a)	125	254	215,9	7/8 (22,2)	8	3/4	23,8	164	141,3	6,5
6	150	279	241,3	7/8 (22,2)	8	3/4	25,4	192	168,3	6,5
8	200	343	298,4	7/8 (22,2)	8	3/4	28,6	246	219,1	6,5
10	250	406	362,0	1 (25,4)	12	7/8	30,2	305	273,0	6,5
12	300	483	431,8	1 (25,4)	12	7/8	31,8	365	323,9	9,5
14	350	533	476,2	1 1/8 (28,6)	12	1	34,9	400	355,6	9,5
16	400	597	539,8	1 1/8 (28,6)	16	1	36,5	457	406,4	9,5
18	450	635	577,8	1 1/4(31,8)	16	1 1/8	39,7	505	457,2	9,5
20	500	698	635,0	1 1/4 (31,8)	20	1 1/8	42,9	559	508,0	9,5
24	600	813	749,3	1 3/8 (34,9)	20	1 1/4	47,6	664	609,6	9,5
a) It is useful to avoid using these dimensions in new constructions.

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

Masse

Masses of Class 150 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
15	0,42	0,42	0,49	0,39	0,41	0,40	0,45
20	0,61	0,61	0,72	0,56	0,57	0,57	0,62
25	0,85	0,86	1,05	0,78	0,80	0,79	0,85
32	1,11	1,16	1,38	1,02	1,05	1,05	1,10
40	1,39	1,53	1,77	1,32	1,37	1,35	1,41
50	2,18	2,41	2,64	2,05	2,12	2,10	2,17
65	3,46	3,95	4,21	3,28	3,40	3,38	3,45
80	4,05	4,90	5,04	3,83	3,99	3,96	3,99
100	5,76	7,03	7,13	5,33	5,56	-	5,53
125	6,63	8,63	8,98	6,08	6,45	-	6,26
150	8,29	11,30	11,00	7,42	7,90	-	7,67
200	13,15	19,65	18,24	12,12		-	12,46
250	18,39	28,74	24,94	16,46	-	-	16,87
300	29,89	43,43	38,28	26,28	-	-	26,89
350	37,48	57,99	50,35	34,49	-	-	39,47
400	50,52	76,05	62,55	44,85	-	-	51,75
450	58,99	93,72	71,07	48,89	-	-	57,13
500	72,86	122,27	87,56	61,77	-	-	71,59
600	96,74	185,27	119,59	87,17	-	-	99,52
Calculated masses of raised face flanges must be used only as a guide.

Class 300 Flange - DN 15 to 600 - ASME B16.5

Type 5

Class 300 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C	G
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	-
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	-
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	-
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	-
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	-
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	-
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	38
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	51
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	76
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	102
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	127
8	200	381	330,2	1 (25,4)	12	7/8	41,3	200
10	250	444	387,4	11/8 (28,6)	16	1	47,6	225
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	279
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	311
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	362
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	406
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	457
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	559
a) It is useful to avoid using these dimensions in new constructions.

[

Type 11

Class 300 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	H3	B3	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	21,3	52,4	15,8	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	26,7	57,2	20,8	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	33,4	61,9	26,7	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	42,2	65,1	35,1	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	48,3	68,3	40,9	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	60,3	69,9	52,6	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	73,0	76,2	62,7	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	88,9	79,4	78,0	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	114,3	85,7	102,4	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	141,3	98,4	128,3	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	168,3	98,4	154,2	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	219,1	111,1	202,7	6,5
10	250	444	387,4	1 1/8 (28,6)	16	1	47,6	321	273,0	117,5	254,5	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	323,9	130,2	304,8	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	355,6	142,9	To be specified by the buyer	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	406,4	146,1		9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	457,2	158,8		9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	508,0	162,0		9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	609,6	168,3		9,5
a) It is useful to avoid using these dimensions in new constructions.

[

Type 12

Class 300 Flange - Type 12 - Slip-on and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	22,4	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	25,4	27,7	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	34,5	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	27,0	43,2	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	30,2	49,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	33,3	62,0	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	38,1	74,7	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	42,9	90,7	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	47,6	116,1	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	50,8	143,8	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	52,4	170,7	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	61,9	221,5	6,5
10	250	444	387,4	1 1/8 (28,6)	16	1	47,6	321	66,8	276,4	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	73,0	327,2	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	76,2	359,2	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	82,6	410,5	9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	88,9	461,8	9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	95,3	513,1	9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	106,4	616,0	9,5
a) It is useful to avoid using these dimensions in new constructions.

[

Type 13

Class 300 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	mini Ø countersink	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	mini Ø countersink	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	T	V	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	16	23,5	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	25,4	16	29,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	17	36,0	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	27,0	21	44,5	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	30,2	22	50,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	33,3	29	63,5	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	38,1	32	76,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	42,9	32	92,0	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	47,6	37	118,0	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	50,8	43	145,0	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	52,4	46	171,0	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	61,9	-	-	6,5
10	250	444	387,4	11/8 (28,6)	16	1	47,6	321	66,8	-	-	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	73,0	-	-	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	76,2	-	-	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	82,6	-	-	9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	88,9	-	-	9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	95,3	-	-	9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	106,4	-	-	9,5
a) It is useful to avoid using these dimensions in new constructions.

[

Type 14

Class 300 Flange - Type 14 - Socket weld and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore		Depth of the socket weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Slip-on, socket weld and weld-on plate	with neck to be butt-welded	Depth of the socket weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	B3	U	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	22,4	15,8	9,5	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	25,4	27,7	20,8	11,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	34,5	26,7	12,5	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	27,0	43,2	35,1	14,5	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	30,2	49,5	40,9	16,0	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	33,3	62,0	52,6	17,5	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	38,1	74,7	62,7	19,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	42,9	90,7	78,0	20,5	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	47,6	116,1	102,4	-	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	50,8	143,8	128,3	-	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	52,4	170,7	154,2	-	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	61,9	221,5	202,7	-	6,5
10	250	444	387,4	11/8 (28,6)	16	1	47,6	321	66,8	276,4	254,5	-	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	73,0	327,2	304,8	-	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	76,2	359,2	To be specified by the buyer	-	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	82,6	410,5		-	9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	88,9	461,8		-	9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	95,3	513,1		-	9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	106,4	616,0		-	9,5
a) It is useful to avoid using these dimensions in new constructions.

[

Type 15

Class 300 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H2	B2	r	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	23,0	3,0	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	25,4	28,0	3,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	35,0	3,0	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	27,0	43,5	5,0	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	30,2	50,0	6,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	33,3	62,5	8,0	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	38,1	75,5	8,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	42,9	91,5	9,5	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	47,6	117,0	9,5	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	50,8	145,0	11,0	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	52,4	171,0	12,5	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	61,9	222,0	12,5	6,5
10	250	444	387,4	1 1/8 (28,6)	16	1	47,6	321	95,3	277,0	12,5	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	101,6	328,0	12,5	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	111,1	360,0	12,5	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	120,7	411,0	12,5	9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	130,2	462,0	12,5	9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	139,7	514,0	12,5	9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	152,4	616,0	12,5	9,5
aa) It is useful to avoid using these dimensions in new constructions.

[

Type 21

Class 300 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	21,3	3
3/4	20	117	82,6	5/8 (19,0)	4	5/8	15,9	48	26,7	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	33,4	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	19,0	64	42,2	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	20,6	70	48,3	3
2	50	165	127,0	3/4 (19,0)	8	5/8	22,2	84	60,3	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	25,4	100	73,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	28,6	117	88,9	3
4	100	254	200,0	7/8 (22,2)	8	3/4	31,8	146	114,3	3
5 a)	125	279	235,0	7/8 (22,2)	8	3/4	34,9	178	141,3	6,5
6	150	318	269,9	7/8 (22,2)	12	3/4	36,5	206	168,3	6,5
8	200	381	330,2	1 (25,4)	12	7/8	41,3	260	219,1	6,5
10	250	444	387,4	1 1/8 (28,6)	16	1	47,6	321	273,0	6,5
12	300	521	450,8	1 1/4 (31,8)	16	11/8	50,8	375	323,9	9,5
14	350	584	514,4	1 1/4 (31,8)	20	11/8	54,0	425	355,6	9,5
16	400	648	571,5	1 3/8 (34,9)	20	1 1/4	57,2	483	406,4	9,5
18	450	711	628,6	1 3/8 (34,9)	24	1 1/4	60,3	533	457,2	9,5
20	500	775	685,8	1 3/8 (34,9)	24	1 1/4	63,5	587	508,0	9,5
24	600	914	812,8	1 5/8 (41,3)	24	1 1/2	69,8	702	609,6	9,5
a) It is useful to avoid using these dimensions in new constructions.

[

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

[

Masse

Masses of Class 300 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
15	-	0,64	0,77	0,64	0,66	0,66	0,70
20	-	1,10	1,30	1,11	1,13	1,14	1,21
25	-	1,39	1,64	1,36	1,40	1,41	1,47
32	-	1,78	2,09	1,67	1,72	1,72	1,79
40	-	2,67	3,00	2,51	2,57	2,57	2,66
50	-	3,17	3,52	2,87	2,96	2,97	3,01
65	-	4,83	5,32	4,30	4,46	4,49	4,48
80	-	6,84	7,19	5,87	6,10	6,17	6,07
100	-	11,52	11,63	9,64	9,98	-	9,94
125	-	15,51	15,52	12,14	12,65	-	12,42
150	-	20,95	19,91	15,69	16,32	-	16,14
200	-	34,35	30,89	24,21	-	-	24,77
250	-	53,23	44,34	33,97	-	-	39,23
300	-	78,86	64,04	49,92	-	-	56,60
350	-	105,40	89,10	69,51	-	-	81,63
400	-	137,77	111,00	88,49	-	-	105,12
450	-	175,18	136,08	108,38	-	-	128,16
500	-	221,43	164,68	134,30	-	-	158,03
600	-	338,78	238,07	201,06	-	-	236,32
Calculated masses of raised face flanges must be used only as a guide.

Class 600 Flange - DN 15 to 600 - ASME B16.5

Type 5

Class 600 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C	G
NPS	DN	mm	mm	in (mm)		in	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	-
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	-
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	-
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	-
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	-
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	-
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	38
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	51
4	100	273	215,9	1 (25,4)	8	7/8	38,1	76
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	102
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	127
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	175
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	222
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	273
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	302
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	349
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	394
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	438
24	600	940	838,2	2 (50,8)	24	17/8	101,6	533
a) It is useful to avoid using these dimensions in new constructions.

Type 11

Class 600 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	B3	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	21,3	To be specified by the buyer	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	26,7		3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	33,4		3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	42,2		3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	48,3		3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	60,3		3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	73,0		3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	88,9		3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	114,3		3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	141,3		6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	168,3		6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	219,1		6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	273,0		6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	323,9		11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	355,6		11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	406,4		11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	457,2		11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	508,0		11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	609,6		11
a) It is useful to avoid using these dimensions in new constructions.

Type 12

Class 600 Flange - Type 12 - Slip-on and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	22,4	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	25,4	27,7	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	34,5	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	28,6	43,2	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	31,8	49,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	36,5	62,0	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	41,3	74,7	3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	46,0	90,7	3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	54,0	116,1	3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	60,3	143,8	6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	66,8	170,7	6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	76,2	221,5	6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	85,7	276,4	6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	92,1	327,2	11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	93,7	359,2	11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	106,4	410,5	11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	117,5	461,8	11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	127,0	513,1	11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	139,7	616,0	11
a) It is useful to avoid using these dimensions in new constructions.

Type 13

Class 600 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	T	V	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	16	23,5	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	25,4	16	29,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	17	36,0	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	28,6	21	44,5	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	31,8	22	50,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	36,5	29	63,5	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	41,3	32	76,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	46,0	35	92,0	3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	54,0	41	118,0	3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	60,3	48	145,0	6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	66,8	51	171,0	6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	76,2	-	-	6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	85,7	-	-	6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	92,1	-	-	11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	93,7	-	-	11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	106,4	-	-	11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	117,5	-	-	11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	127,0	-	-	11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	139,7	-	-	11
a) It is useful to avoid using these dimensions in new constructions.

Type 14

Class 600 Flange - Type 14 - Socket weld and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore		Depth of the socket weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Slip-on, socket weld and weld-on plate	With neck to be butt-welded	Depth of the socket weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	B3	U	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	22,4	To be specified by the buyer	9,5	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	25,4	27,7		11,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	34,5		12,5	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	28,6	43,2		14,5	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	31,8	49,5		16,0	3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	36,5	62,0		17,5	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	41,3	74,7		19,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	46,0	90,7		20,5	3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	54,0	116,1		-	3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	60,3	143,8		-	6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	66,8	170,7		-	6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	76,2	221,5		-	6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	85,7	276,4		-	6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	92,1	327,2		-	11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	93,7	359,2		-	11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	106,4	410,5		-	11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	117,5	461,8		-	11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	127,0	513,1		-	11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	139,7	616,0		-	11
a) It is useful to avoid using these dimensions in new constructions.

Type 15

Class 600 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H2	B2	r	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	22,2	23,0	3,0	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	25,4	28,0	3,0	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	27,0	35,0	3,0	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	28,6	43,5	5,0	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	31,8	50,0	6,5	3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	36,5	62,5	8,0	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	41,3	75,5	8,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	46,0	91,5	9,5	3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	54,0	117,0	9,5	3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	60,3	145,0	11,0	6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	66,8	171,0	12,5	6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	76,2	222,0	12,5	6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	111,1	277,0	12,5	6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	117,5	328,0	12,5	11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	127,0	360,0	12,5	11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	139,7	411,0	12,5	11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	151,4	462,0	12,5	11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	165,1	514,0	12,5	11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	184,2	616,0	12,5	11
a) It is useful to avoid using these dimensions in new constructions.

Type 21

Class 600 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	R1
NPS	DN	mm	mm	in (mm)		in	mm	mm	mm	mm
1/2	15	95	66,7	5/8 (15,9)	4	1/2	14,3	38	21,3	3
3/4	20	117	82,6	3/4 (19,0)	4	5/8	15,9	48	26,7	3
1	25	124	88,9	3/4 (19,0)	4	5/8	17,5	54	33,4	3
1 1/4 a)	32	133	98,4	3/4 (19,0)	4	5/8	20,6	64	42,2	3
1 1/2	40	156	114,3	7/8 (22,2)	4	3/4	22,2	70	48,3	3
2	50	165	127,0	3/4 (19,0)	8	5/8	25,4	84	60,3	3
2 1/2 a)	65	190	149,2	7/8 (22,2)	8	3/4	28,6	100	73,0	3
3	80	210	168,3	7/8 (22,2)	8	3/4	31,8	117	88,9	3
4	100	273	215,9	1 (25,4)	8	7/8	38,1	152	114,3	3
5 a)	125	330	266,7	1 1/8 (28,6)	8	1	44,4	189	141,3	6,5
6	150	356	292,1	1 1/8 (28,6)	12	1	47,6	222	168,3	6,5
8	200	419	349,2	1 1/4(31,8)	12	11/8	55,6	273	219,1	6,5
10	250	508	431,8	1 7/8 (34,9)	16	11/4	63,5	343	273,0	6,5
12	300	559	489,0	1 3/8 (34,9)	20	11/4	66,7	400	323,9	11
14	350	603	527,0	1 1/2 (38,1)	20	13/8	69,8	432	355,6	11
16	400	686	603,2	1 5/8 (41,3)	20	11/2	76,2	495	406,4	11
18	450	743	654,0	1 3/4 (44,4)	20	15/8	82,6	546	457,2	11
20	500	813	723,9	1 3/4 (44,4)	24	15/8	88,9	610	508,0	11
24	600	940	838,2	2 (50,8)	24	17/8	101,6	718	609,6	11
a) It is useful to avoid using these dimensions in new constructions.

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

Masse

Masses of Class 600 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
15	-	0,76	0,89	0,74	0,76	0,76	0,70
20	-	1,27	1,49	1,26	1,29	1,29	1,21
25	-	1,61	1,88	1,53	1,57	1,58	1,47
32	-	2,22	2,55	2,02	2,08	2,09	1,93
40	-	3,27	3,62	2,99	3,06	3,08	2,86
50	-	4,14	4,49	3,61	3,73	3,78	3,42
65	-	6,10	6,61	5,24	5,44	5,53	5,00
80	-	8,51	8,85	7,05	7,33	7,49	6,70
100	-	17,27	17,92	14,51	14,94	-	14,00
125	-	29,38	30,01	24,38	25,05	-	23,70
150	-	36,15	36,20	28,84	29,71	-	28,10
200	-	58,89	55,59	43,37	-	-	42,33
250	-	97,54	89,52	70,26	-	-	75,37
300	-	124,21	107,02	84,25	-	-	90,66
350	-	151,00	126,83	98,87	-	-	108,32
400	-	213,77	176,16	142,20	-	-	155,50
450	-	272,28	210,79	173,52	-	-	188,28
500	-	349,81	262,82	220,69	-	-	242,23
600	-	533,60	368,57	312,90	-	-	346,29
Calculated masses of raised face flanges must be used only as a guide.

Class 900 Flange - DN 80 to 600 - ASME B16.5

Type 5

Class 900 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C	G
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	48
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	73
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	95
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	121
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	165
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	213
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	257
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	286
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	381
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	419
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	451
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	508
a) It is useful to avoid using these dimensions in new constructions.

Type 11

Class 900 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	H3	B3	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	127	88,9	101,6	To be specified by the buyer	3
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	159	114,3	114,3		5
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	190	141,3	127,0		6,5
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	235	168,3	139,7		6,5
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	298	219,1	162,0		6,5
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	368	273,0	184,2		6,5
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	419	323,9	200,0		9,5
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	451	355,6	212,8		11,5
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	508	406,4	215,9		11
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	565	457,2	228,6		11
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	622	508,0	247,7		11
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	749	609,6	292,1		11
a) It is useful to avoid using these dimensions in new constructions.

Type 12

Class 900 Flange - Type 12 - Slip-on and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	127	54,0	90,7	3
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	159	69,9	116,1	5
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	190	79,4	143,8	6,5
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	235	85,7	170,7	6,5
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	298	101,6	221,5	6,5
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	368	108,0	276,4	6,5
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	419	117,5	327,2	9,5
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	451	130,2	359,2	11,5
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	508	133,4	410,5	11
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	565	152,4	461,8	11
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	622	158,8	513,1	11
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	749	203,2	616,0	11
a) It is useful to avoid using these dimensions in new constructions.

Type 13

Class 900 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	T	V	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	127	54,0	41	92	3
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	159	69,9	48	118	5
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	190	79,4	54	145	6,5
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	235	85,7	57	171	6,5
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	298	101,6	-	-	6,5
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	368	108,0	-	-	6,5
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	419	117,5	-	-	9,5
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	451	130,2	-	-	11,5
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	508	133,4	-	-	11
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	565	152,4	-	-	11
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	622	158,8	-	-	11
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	749	203,2	-	-	11
a) It is useful to avoid using these dimensions in new constructions.

Type 15

Class 900 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H2	B2	r	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	127	54,0	91,5	9,5	3
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	159	69,9	117,0	11,0	5
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	190	79,4	145,0	11,0	6,5
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	235	85,7	171,0	12,5	6,5
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	298	114,3	222,0	12,5	6,5
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	368	127,0	277,0	12,5	6,5
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	419	142,9	328,0	12,5	9,5
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	451	155,6	360,0	12,5	11,5
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	508	165,1	411,0	12,5	11
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	565	190,5	462,0	12,5	11
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	622	209,6	514,0	12,5	11
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	749	266,7	616,0	12,5	11
a) It is useful to avoid using these dimensions in new constructions.

Type 21

Class 900 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm
For DN 1/2 to 2 1/2 see flanges Class 1500
3	80	241	190,5	1 (25,4)	8	7/8	38,1	127	88,9	3
4	100	292	235,0	1 1/4 (31,8)	8	1 1/8	44,4	159	114,3	5
5 a)	125	349	279,4	1 3/8 (34,9)	8	1 1/4	50,8	190	141,3	6,5
6	150	381	317,5	1 1/4 (31,8)	12	1 1/8	55,6	235	168,3	6,5
8	200	470	393,7	1 1/2 (38,1)	12	1 3/8	63,5	298	219,1	6,5
10	250	546	469,9	1 1/2 (38,1)	16	1 3/8	69,8	368	273,0	6,5
12	300	610	533,4	1 1/2 (38,1)	20	1 3/8	79,4	419	323,9	9,5
14	350	641	558,8	1 5/8 (41,3)	20	1 1/8	85,7	451	355,6	11,5
16	400	705	616,0	1 3/4 (44,4)	20	1 5/8	88,9	508	406,4	11
18	450	787	685,8	2 (50,8)	20	1 7/8	101,6	565	457,2	11
20	500	857	749,3	2 1/8 (54,0)	20	2	108,0	622	508,0	11
24	600	1 041	901,7	2 5/8 (66,7)	20	2 1/2	139,7	749	609,6	11
a) It is useful to avoid using these dimensions in new constructions.

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

Masse

Masses of Class 900 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
80	-	13,07	14,02	11,58	11,91	-	11,22
100	-	22,10	23,12	19,73	20,27	-	19,20
125	-	36,46	37,05	31,88	32,75	-	31,17
150	-	47,44	49,23	41,14	42,25	-	40,40
200	-	82,53	84,17	70,72	-	-	72,75
250	-	122,44	122,85	100,45	-	-	105,98
300	-	173,67	162,88	133,13	-	-	141,89
350	-	206,09	186,20	153,24	-	-	162,40
400	-	259,52	224,24	185,08	-	-	200,10
450	-	366,87	301,27	258,06	-	-	279,92
500	-	463,67	373,75	316,70	-	-	351,14
600	-	875,65	681,13	604,92	-	-	672,06
Calculated masses of raised face flanges must be used only as a guide.

Class 1500 Flange - DN 15 to 600 - ASME B16.5

Type 5

Class 1500 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C	G
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	-
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	-
1	25	149	101,6	1 (25,4)	4	7/8	28,6	-
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	-
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	-
2	50	216	165,1	1 (25,4)	8	7/8	38,1	-
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	32
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	44
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	66
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	86
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	111
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	152
10	250	584	482,6	2 (50,8)	12	17/8	108,0	197
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	238
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	263
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	305
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	346
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	390
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	473
a) It is useful to avoid using these dimensions in new constructions.

Type 11

Class 1500 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	H3	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	21,3	60,3	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	26,7	69,9	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	33,4	73,0	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	42,2	73,0	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	48,3	82,6	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	60,3	101,6	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	73,0	104,8	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	88,9	117,5	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	114,3	123,8	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	141,3	155,6	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	168,3	171,5	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	219,1	212,7	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	273,0	254,0	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	323,9	282,6	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	355,6	298,5	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	406,4	311,2	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	457,2	327,0	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	508,0	355,6	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	609,6	406,4	11
a) It is useful to avoid using these dimensions in new constructions. B3 : To be specified by the buyer

Type 12

Class 1500 Flange - Type 12 - Slip-on and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	31,8	22,4	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	34,9	27,7	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	41,3	34,5	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	41,3	43,2	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	44,5	49,5	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	57,2	62,0	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	63,5	74,7	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	73,0	-	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	90,5	-	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	104,8	-	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	119,1	-	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	142,9	-	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	158,8	-	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	181,0	-	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	-	-	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	-	-	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	-	-	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	-	-	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	-	-	11
a) It is useful to avoid using these dimensions in new constructions.

Type 13

Class 1500 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	T	V	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	31,8	22	23,5	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	34,9	25	29,0	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	41,3	29	36,0	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	41,3	30	44,5	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	44,5	32	50,5	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	57,2	38	63,5	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	63,5	48	76,0	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	73,0	51	92,0	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	90,5	57	118,0	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	104,8	64	145,0	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	119,1	70	171,0	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	142,9	-	-	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	158,8	-	-	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	181,0	-	-	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	-	-	-	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	-	-	-	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	-	-	-	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	-	-	-	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	-	-	-	11
a) It is useful to avoid using these dimensions in new constructions.

Type 14

Class 1500 Flange - Type 14 - Socket weld and weld neck flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Depth of the socket weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Depth of the socket weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H1	B1	U	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	31,8	22,4	9,5	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	34,9	27,7	11,0	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	41,3	34,5	12,5	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	41,3	43,2	14,5	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	44,5	49,5	16,0	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	57,2	62,0	17,5	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	63,5	74,7	19,0	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	73,0	-	-	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	90,5	-	-	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	104,8	-	-	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	119,1	-	-	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	142,9	-	-	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	158,8	-	-	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	181,0	-	-	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	-	-	-	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	-	-	-	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	-	-	-	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	-	-	-	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	-	-	-	11
a) It is useful to avoid using these dimensions in new constructions. B3 : To be specified by the buyer

Type 15

Class 1500 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Ø of bore	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H2	B2	r	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	31,8	23,0	3,0	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	34,9	28,0	3,0	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	41,3	35,0	3,0	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	41,3	43,5	5,0	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	44,5	50,0	6,5	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	57,2	62,5	8,0	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	63,5	75,5	8,0	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	73,0	91,5	9,5	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	90,5	117,0	11,0	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	104,8	145,0	11,0	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	119,1	171,0	12,5	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	142,9	222,0	12,5	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	177,8	277,0	12,5	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	219,1	328,0	12,5	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	241,3	360,0	12,5	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	260,4	411,0	12,5	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	276,2	462,0	12,5	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	292,1	514,0	12,5	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	330,2	616,0	12,5	11
a) It is useful to avoid using these dimensions in new constructions.

Type 21

Class 1500 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	Mm
1/2	15	121	82,6	7/8 (22,2)	4	3/4	22,2	38	21,3	5
3/4	20	130	88,9	7/8 (22,2)	4	3/4	25,4	44	26,7	5
1	25	149	101,6	1 (25,4)	4	7/8	28,6	52	33,4	5
1 1/4 a)	32	159	111,1	1 (25,4)	4	7/8	28,6	64	42,2	5
1 1/2	40	178	123,8	1 1/8 (28,6)	4	1	31,8	70	48,3	5
2	50	216	165,1	1 (25,4)	8	7/8	38,1	105	60,3	5
2 1/2 a)	65	244	190,5	1 1/8 (28,6)	8	1	41,3	124	73,0	5
3	80	267	203,2	1 1/4 (31,8)	8	11/8	47,6	133	88,9	5
4	100	311	241,3	1 3/8 (34,9)	8	11/4	54,0	162	114,3	5
5 a)	125	375	292,1	1 5/8 (41,3)	8	11/2	73,0	197	141,3	6,5
6	150	394	317,5	1 1/2 (38,1)	12	13/8	82,6	229	168,3	6,5
8	200	483	393,7	1 3/4 (44,4)	12	15/8	92,1	292	219,1	6,5
10	250	584	482,6	2 (50,8)	12	17/8	108,0	368	273,0	9,5
12	300	673	571,5	2 1/8 (54,0)	16	2	123,8	451	323,9	11
14	350	749	635,0	2 3/8 (60,3)	16	21/4	133,4	495	355,6	11
16	400	826	704,8	2 5/8 (66,7)	16	21/2	146,1	552	406,4	11
18	450	914	774,7	2 7/8 (73,0)	16	23/4	161,9	597	457,2	11
20	500	984	831,8	3 1/8 (79,4)	16	3	178,0	641	508,0	11
24	600	1 168	990,6	3 5/8 (92,0)	16	31/2	203,0	762	609,6	11
a) It is useful to avoid using these dimensions in new constructions.

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

Masse

Masses of Class 1500 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
15	-	1,78	1,91	1,75	1,78	1,79	1,72
20	-	2,41	2,59	2,33	2,36	2,39	2,28
25	-	3,56	3,77	3,42	3,48	3,53	3,36
32	-	4,16	4,42	3,93	4,01	4,07	3,84
40	-	5,78	6,08	5,40	5,50	5,57	5,27
50	-	10,08	11,14	9,87	10,05	10,22	9,67
65	-	13,93	15,34	13,62	13,92	14,20	13,37
80	-	19,18	20,34	-	18,35	-	17,55
100	-	29,93	30,56	-	28,46	-	27,23
125	-	58,51	58,15	-	53,06	-	51,17
150	-	72,02	70,16	-	62,78	-	60,51
200	-	121,91	119,78	-	-	-	102,32
250	-	210,62	204,65	-	-	-	180,64
300	-	315,83	304,04	-	-	-	284,28
350	-	420,57	399,73	-	-	-	383,75
400	-	559,16	508,66	-	-	-	493,98
450	-	759,99	659,54	-	-	-	636,46
500	-	965,37	806,96	-	-	-	765,15
600	-	1 556,84	1 278,03	-	-	-	1 220,79
Calculated masses of raised face flanges must be used only as a guide.

Class 2500 Flange - DN 15 to 300 - ASME B16.5

Type 5

Class 2500 Flange - Type 05 - Blind flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of shoulder
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of shoulder
NPS	DN	D	K	L			C	G
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm
1/2	15	133	88,9	7/8 (22,2)	4	3/4	30,2	-
3/4	20	140	95,2	7/8 (22,2)	4	3/4	31,7	-
1	25	159	107,9	1 (25,4)	4	7/8	34,9	-
1 1/4 a)	32	184	130,2	1 1/8 (28,6)	4	1	38,1	-
1 1/2	40	203	146,0	1 1/4 (31,8)	4	1 1/8	44,4	-
2	50	235	171,4	1 1/8 (28,6)	8	1	50,8	-
2 1/2 a)	65	267	196,8	1 1/4 (31,8)	8	1 1/8	57,1	22
3	80	305	228,6	1 3/8 (34,9)	8	1 1/4	66,7	32
4	100	356	273,0	1 5/8 (41,3)	8	1 1/2	76,2	48
5 a)	125	419	323,8	1 7/8 (47,6)	8	1 3/4	92,1	67
6	150	483	368,3	2 1/8 (54,0)	8	2	108,0	86
8	200	552	438,1	2 1/8 (54,0)	12	2	127,0	96
10	250	673	539,7	2 5/8 (66,7)	12	2 1/2	165,1	159
12	300	762	619,1	2 7/8 (73,0)	12	2 3/4	184,1	193
a) It is useful to avoid using these dimensions in new constructions.

Type 11

Class 2500 Flange - Type 11 - Flange with butt-weld neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Height of the neck	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Height of the neck	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	H3	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm
1/2	15	133	88,9	7/8 (22,2)	4	3/4	30,2	43	73,0	5
3/4	20	140	95,2	7/8 (22,2)	4	3/4	31,7	51	79,4	5
1	25	159	107,9	1 (25,4)	4	7/8	34,9	57	88,9	5
1 1/4 a)	32	184	130,2	1 1/8 (28,6)	4	1	38,1	73	95,3	5
1 1/2	40	203	146,0	1 1/4 (31,8)	4	1 1/8	44,4	79	111,1	9,5
2	50	235	171,4	1 1/8 (28,6)	8	1	50,8	95	127,0	9,5
2 1/2 a)	65	267	196,8	1 1/4 (31,8)	8	1 1/8	57,1	114	142,9	9,5
3	80	305	228,6	1 3/8 (34,9)	8	1 1/4	66,7	133	168,3	9,5
4	100	356	273,0	1 5/8 (41,3)	8	1 1/2	76,2	165	190,5	9,5
5 a)	125	419	323,8	1 7/8 (47,6)	8	1 3/4	92,1	203	228,6	9,5
6	150	483	368,3	2 1/8 (54,0)	8	2	108,0	235	273,1	15,5
8	200	552	438,1	2 1/8 (54,0)	12	2	127,0	305	317,5	15,5
10	250	673	539,7	2 5/8 (66,7)	12	2 1/2	165,1	375	419,1	15,5
12	300	762	619,1	2 7/8 (73,0)	12	2 3/4	184,1	441	463,6	15,5
a) It is useful to avoid using these dimensions in new constructions. B3 : To be specified by the buyer

Type 13

Class 2500 Flange - Type 13 - Threaded flange with neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Height of the neck	Minimum thread length	Mini Ø countersink	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	H1	T	V	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm
1/2	15	133	88,9	7/8 (22,2)	4	3/4	30,2	39,7	29	23,5	5
3/4	20	140	95,2	7/8 (22,2)	4	3/4	31,7	42,9	32	29,0	5
1	25	159	107,9	1 (25,4)	4	7/8	34,9	47,6	35	35,0	5
1 1/4 a)	32	184	130,2	1 1/8 (28,6)	4	1	38,1	52,4	38	44,5	5
1 1/2	40	203	146,0	1 1/4 (31,8)	4	1 1/8	44,4	60,3	44	50,5	9,5
2	50	235	171,4	1 1/8 (28,6)	8	1	50,8	69,9	51	63,5	9,5
2 1/2 a)	65	267	196,8	1 1/4 (31,8)	8	1 1/8	57,1	79,4	57	76,0	9,5
3	80	305	228,6	1 3/8 (34,9)	8	1 1/4	66,7	92,1	64	92,0	9,5
4	100	356	273,0	1 5/8 (41,3)	8	1 1/2	76,2	108,0	70	118,0	9,5
5 a)	125	419	323,8	1 7/8 (47,6)	8	1 3/4	92,1	130,2	76	145,0	9,5
6	150	483	368,3	2 1/8 (54,0)	8	2	108,0	152,4	83	171,0	15,5
8	200	552	438,1	2 1/8 (54,0)	12	2	127,0	-	-	-	15,5
10	250	673	539,7	2 5/8 (66,7)	12	2 1/2	165,1	-	-	-	15,5
12	300	762	619,1	2 7/8 (73,0)	12	2 3/4	184,1	-	-	-	15,5
a) It is useful to avoid using these dimensions in new constructions.

Type 15

Class 2500 Flange - Type 15 - Rotating flange with neck for the end of the pipework with a drawn neck

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø d'alésage	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Height of the neck	Ø d'alésage	Joint radius of the flange bore (min.)	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	H2	B2	r	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm	mm	mm	mm
1/2	15	133	88,9	7/8 (22,2)	4	3/4	30,2	43	21,3	39,7	23,0	3,0	5
3/4	20	140	95,2	7/8 (22,2)	4	3/4	31,7	51	26,7	42,9	28,0	3,0	5
1	25	159	107,9	1 (25,4)	4	7/8	34,9	57	33,4	47,6	35,0	3,0	5
1 1/4 a)	32	184	130,2	1 1/8 (28,6)	4	1	38,1	73	42,2	52,4	43,5	5,0	5
1 1/2	40	203	146,0	1 1/4 (31,8)	4	1 1/8	44,4	79	48,3	60,3	50,0	6,5	9,5
2	50	235	171,4	1 1/8 (28,6)	8	1	50,8	95	60,3	69,9	62,5	8,0	9,5
2 1/2 a)	65	267	196,8	1 1/4 (31,8)	8	1 1/8	57,1	114	73,0	79,4	75,5	8,0	9,5
3	80	305	228,6	1 3/8 (34,9)	8	1 1/4	66,7	133	88,9	92,1	91,5	9,5	9,5
4	100	356	273,0	1 5/8 (41,3)	8	1 1/2	76,2	165	114,3	108,0	117,0	11,0	9,5
5 a)	125	419	323,8	1 7/8 (47,6)	8	1 3/4	92,1	203	141,3	130,2	145,0	11,0	9,5
6	150	483	368,3	2 1/8 (54,0)	8	2	108,0	235	168,3	152,4	171,0	12,5	15,5
8	200	552	438,1	2 1/8 (54,0)	12	2	127,0	305	219,1	177,8	222,0	12,5	15,5
10	250	673	539,7	2 5/8 (66,7)	12	2 1/2	165,1	375	273,0	228,6	277,0	12,5	15,5
12	300	762	619,1	2 7/8 (73,0)	12	2 3/4	184,1	441	323,9	254,0	328,0	12,5	15,5
a) It is useful to avoid using these dimensions in new constructions.

Type 21

Class 2500 Flange - Type 21 - Integral flange

Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Bolts			Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
Nominal diameter		Ext. Ø of flange	Ø of drilling circle	Ø of bolt holes	Number	Nominal size	Flange thickness	Ø of base neck	Ø of neck to the right of the weld	Joint radius of the neck (min.)
NPS	DN	D	K	L			C	N	A	R1
NPS	DN	mm	mm	Pouce (mm)		Pouce	mm	mm	mm	mm
1/2	15	133	88,9	7/8 (22,2)	4	3/4	30,2	43	21,3	5
3/4	20	140	95,2	7/8 (22,2)	4	3/4	31,7	51	26,7	5
1	25	159	107,9	1 (25,4)	4	7/8	34,9	57	33,4	5
1 1/4 a)	32	184	130,2	1 1/8 (28,6)	4	1	38,1	73	42,2	5
1 1/2	40	203	146,0	1 1/4 (31,8)	4	1 1/8	44,4	79	48,3	9,5
2	50	235	171,4	1 1/8 (28,6)	8	1	50,8	95	60,3	9,5
2 1/2 a)	65	267	196,8	1 1/4 (31,8)	8	1 1/8	57,1	114	73,0	9,5
3	80	305	228,6	1 3/8 (34,9)	8	1 1/4	66,7	133	88,9	9,5
4	100	356	273,0	1 5/8 (41,3)	8	1 1/2	76,2	165	114,3	9,5
5 a)	125	419	323,8	1 7/8 (47,6)	8	1 3/4	92,1	203	141,3	9,5
6	150	483	368,3	2 1/8 (54,0)	8	2	108,0	235	168,3	15,5
8	200	552	438,1	2 1/8 (54,0)	12	2	127,0	305	219,1	15,5
10	250	673	539,7	2 5/8 (66,7)	12	2 1/2	165,1	375	273,0	15,5
12	300	762	619,1	2 7/8 (73,0)	12	2 3/4	184,1	441	323,9	15,5
a) It is useful to avoid using these dimensions in new constructions.

Tolerances

Dimension	Types of flange		Tolerances mm	Nominal diameter Pouce
Diameter of neck at the end weld A	11, 21		+ 2,4 – 0,8	≤ 5
Diameter of neck at the end weld A	11, 21		+ 4,0 – 0,8	> 5
Diameter of bore B1, B2	01, 12, 14, 15		+ 0,8 – 0	≤ 10
Diameter of bore B1, B2	01, 12, 14, 15		+ 1,6 – 0	> 10
Diameter of bore B3	11, 14		± 0,8	≤ 10
			± 1,6	> 10 ≤ 18
			+ 3,2 – 1,6	> 18
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 1,6	≤ 10
Height of the neck H1, H2, H3	11, 12, 13, 14, 15		± 3,2	> 10
Flange thickness C	All types		+ 3,2 0	≤ 18
Flange thickness C	All types		+ 4,8 0	> 18
External diameter of the raised face 0	All types	1,6 mm Raised face	± 0,8 mm	All
External diameter of the raised face 0	All types	6,4 mm Raised face	± 0,4 mm	All
Dimensions of faces M, Q, W, Y et Z	All types	Faces of C, D, E, F type joints	± 0,4 mm	All
Depth of the groove E for ring joint	All types	Faces of C type joints	+ 4,8 – 0	All
Thickness of groove F			± 0,2 mm
Diameter at the centre of groove P			± 0,13 mm
Angle 23°			± ½°
Diameter of drilling circle K	All types		± 1,6 mm	All
Spacing between two adjacent bolt holes	All types		± 0,8 mm	All
Eccentricity between the drilling circle and the diameters of the machined faces	All types		0,8 mm	≤ 2½
	All types		1,6 mm	> 2½
Parallelism between the supporting surfaces of the bolts and the joint faces of the flange	All types		1°	All

Masse

Masses of Class 2500 flanges (kg)
DN	Type
DN	01	05	11	12	13	14	15
15	-	2,98	3,23	-	2,97	-	2,91
20	-	3,52	3,90	-	3,51	-	3,42
25	-	4,99	5,53	-	4,91	-	4,78
32	-	7,34	8,19	-	7,23	-	7,04
40	-	10,38	11,48	-	10,12	-	9,86
50	-	15,58	17,22	-	15,05	-	14,63
65	-	22,68	25,44	-	21,88	-	21,25
80	-	34,88	38,92	-	33,18	-	32,26
100	-	54,11	60,07	-	50,74	-	49,35
125	-	90,76	100,27	-	84,40	-	82,20
150	-	141,64	156,37	-	130,14	-	127,45
200	-	214,06	233,79	-	-	-	186,30
250	-	410,84	445,71	-	-	-	353,61
300	-	592,20	628,13	-	-	-	501,81
Calculated masses of raised face flanges must be used only as a guide.