ASME B16.5 Welding Flange Dimensions and Weight Parameters

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Update time : 2025-12-09 09:46:30

　　The size and weight of SS316L butt welded flanges must strictly comply with ASME B16.5 or EN1092-1 standards. The parameters of different nominal diameters (DN) and pressure grades (Class/PN) have significant differences. The following are examples of key parameters for common specifications (taking ASME B16.5 as an example):

ASME B16.5 Class 150

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	88.90	15.70	11.20	47.80	21.30	30.20	35.00	4	15.70	60.45	0.48
3/4	26.70	98.60	20.80	12.70	52.30	26.70	38.10	42.90	4	15.70	69.85	0.71
1	33.40	108.0	26.70	14.20	55.60	33.50	49.30	50.80	4	15.70	79.25	1.01
11/4	42.20	117.3	35.10	15.70	57.15	42.20	58.70	63.50	4	15.70	88.90	1.33
11/2	48.30	127.0	40.90	17.50	62.00	48.30	65.00	73.15	4	15.70	98.60	1.72
2	60.30	152.4	52.60	19.10	63.50	60.45	77.70	91.90	4	19.10	120.7	2.58
21/2	73.00	177.8	62.70	22.40	69.85	73. 15	90.4	104.6	4	19.10	139.7	4.11
3	88.90	190.5	78.00	23.90	69.85	88.90	108.0	127.0	4	19.10	152.4	4.92
31/2	101.6	215.9	90.20	23.90	71.40	101.6	122.2	139.7	8	19.10	177.8	6.08
4	114.3	228.6	102.40	23.90	76.20	114.3	134.9	157.2	8	19.10	190.5	6.84
5	141.3	254.0	128.3	23.90	88.90	141.2	163.6	185.7	8	22.40	215.9	8.56
6	168.3	279.4	154.2	25.40	88.90	168.4	192.0	215.9	8	22.40	241.3	10.6
8	219.1	342.9	202.7	28.40	101.6	219.2	246.1	269.7	8	22.40	298.5	17.6
10	273.0	406.4	254.5	30.20	101.6	273.0	304.8	323.8	12	25.40	362.0	24.0
12	323.8	482.6	304.8	31.75	114.3	323.8	365.3	381.0	12	25.40	431.8	36.5
14	355.6	533.4	To be specified by the Purchaser	35.10	127.0	355.6	400.1	412.7	12	28.40	476.3	48.4
16	406.4	596.9		36.60	127.0	406.4	475.2	469.9	16	28.40	539.8	60.6
18	457.2	635.0		39.60	139.7	457.2	505.0	533.4	16	31.75	577.9	68.3
20	508.0	698.5		42.90	144.5	508.0	558.8	584.2	20	31.75	635.0	84.5
24	609.6	812.8		47.80	152.4	609.6	663.4	692.1	20	35.10	749.3	115

Class 300 WN flange

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	95.20	15.70	14.20	52.30	21.30	38.10	35.00	4	15.70	66.55	0.75
3/4	26.70	117.3	20.80	15.70	57.15	26.70	47.70	42.90	4	19.00	82.50	1.26
1	33.40	123.9	26.70	17.50	62.00	33.50	53.80	50.80	4	19.00	88.90	1.52
1 1/4	42.20	133.3	35.10	19.00	65.00	42.20	63.50	63.50	4	19.00	98.50	2.03
1 1/2	48.30	155.4	40.90	20.60	68.30	48.30	69.85	73. 15	4	22.30	114.3	2.89
2	60.30	165. 1	52.60	22.30	69.85	60.45	84.00	91.90	8	19.00	127.0	3.4
2 1/2	73.00	190.5	62.70	25.40	76.20	73.15	100.0	104.6	8	22.30	149.3	5.17
3	88.90	209.5	78.00	28.40	79.25	88.90	117.3	127.0	8	22.30	168.1	6.93
3 1/2	101.6	228.6	90.20	30.20	81.00	101.6	133.3	139.7	8	22.30	184.1	8.67
4	114.3	254.0	102.4	31.70	85.80	114.3	146.0	157.2	8	22.30	200.1	11.2
5	141.3	279.4	128.3	35.00	98.50	141.2	177.8	185.7	8	22.30	234.9	15.1
6	168.3	317.5	154.2	36.50	98.50	168.4	206.2	215.9	12	22.30	269.7	19.1
8	219.1	381.0	202.7	41.10	111.2	219.2	260.3	269.7	12	25.40	330.2	29.9
10	273.0	444.5	254.5	47.70	117.3	273.0	320.5	323.8	16	28.40	387.3	42.7
12	323.8	520.7	304.8	50.80	130.0	323.8	374.6	381.0	16	31.70	450.8	61.8
14	355.6	584.2	To be specified by the Purchaser	53.80	142.7	355.6	425.4	412.7	20	31.70	514.3	85.8
16	406.4	647.7		57.15	146.0	406.4	482.6	469.9	20	35.00	571.5	106
18	457.2	711.2		60.45	158.7	457.2	533.4	533.4	24	35.00	628.6	131
20	508.0	774.7		63.50	162.0	508.0	587.2	584.2	24	35.00	685.8	158
24	609.6	914.4		69.85	168.1	609.6	701.5	692.1	24	41.10	812.8	bux230

Class 600 stainless steel butt welding flange

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	95.30	To be specified by the Purchaser	14.20	52.30	21.30	38.10	35.00	4	15.70	66.55	0.87
3/4	26.70	117.3		15.70	57.15	26.70	47.80	42.90	4	19.10	82.60	1.45
1	33.40	124.0		17.50	62.00	33.50	53.80	50.80	4	19.10	88.90	1.76
11/4	42.20	133.4		20.60	66.55	42.20	63.50	63.50	4	19.10	98.60	2.49
11/2	48.30	155.4		22.40	69.85	48.30	69.85	73. 15	4	22.40	114.3	3.49
2	60.30	165. 1		25.40	73.15	60.45	84.10	91.90	8	19.10	127.0	4.36
21/2	73.00	190.5		28.40	79.25	73.15	100.1	104.6	8	22.40	149.4	6.43
3	88.90	209.6		31.75	82.60	88.90	117.3	127.0	8	22.40	168.1	8.53
31/2	101.6	228.6		35.10	85.90	101.6	133.4	139.7	8	25.40	184.2	10.7
4	114.3	273. 1		38.10	101.6	114.3	152.4	157.2	8	25.40	215.9	17.4
5	141.3	330.2		44.50	114.3	141.2	189.0	185.7	8	28.40	266.7	29.2
6	168.3	355.6		47.80	117.3	168.4	222.3	215.9	12	28.40	292.1	34.9
8	219.1	419. 1		55.60	133.4	219.2	273.1	269.7	12	31.75	349.3	53.9
10	273.0	508.0		63.50	152.4	273.0	342.9	323.8	16	35.10	431.8	86.5
12	323.8	558.8		66.55	155.4	323.8	400.1	381.0	20	35.10	489.0	103
14	355.6	603.3		69.85	165.1	355.6	431.8	412.7	20	38.10	527.1	122
16	406.4	685.8		76.20	177.8	406.4	495.3	469.9	20	41.10	603.3	170
18	457.2	743.0		82.60	184.2	457.2	546.1	533.4	20	44.50	654.1	204
20	508.0	812.8		88.90	190.5	508.0	609.6	584.2	24	44.50	723.9	254
24	609.6	939.8		101.6	203.2	609.6	717.6	692.1	24	50.80	838.2	358

Class 900 SS316 WN flange size and weight parameters

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	120.6	To be specified by the Purchaser	22.30	60.45	21.30	38.10	35.00	4	22.30	82.50	1.87
3/4	26.70	130.0		25.40	69.85	26.70	44.00	42.90	4	22.30	88.90	2.56
1	33.40	149.3		28.40	73.15	33.50	52.30	50.80	4	25.40	101.6	3.74
11/4	42.20	158.7		28.40	73.15	42.20	63.50	63.50	4	25.40	111.2	4.33
11/2	48.30	177.8		31.70	82.50	48.30	69.85	73.15	4	28.40	123.9	5.94
2	60.30	215.9		38.10	101.6	60.45	104.6	91.90	8	25.40	165.1	10.8
21/2	73.00	244.3		41.10	104.6	73.15	123.9	104.6	8	28.40	190.5	15.0
3	88.90	241.3		38.10	101.6	88.90	127.0	127.0	8	25.40	190.5	13.7
4	114.3	292.1		44.40	114.3	114.3	158.7	157.2	8	31.70	234.9	22.5
5	141.3	349.2		50.80	127.0	141.2	190.5	185.7	8	35.00	279.4	37.4
6	168.3	381.0		55.60	139.7	168.4	234.9	215.9	12	31.70	317.5	47.7
8	219. 1	469.9		63.50	162.0	219.2	298.4	269.7	12	38.10	393.7	81.3
10	273.0	546.1		69.85	184. 1	273.0	368.3	323.8	16	38.10	469.9	119
12	323.8	609.6		79.25	200. 1	323.8	419.1	381.0	20	38.10	533.4	157
14	355.6	641.3		85.80	212.8	355.6	450.8	412.7	20	41.10	558.8	180
16	406.4	704.8		88.90	215.9	406.4	508.0	469.9	20	44.40	615.9	217
18	457.2	787.4		101.6	228.6	457.2	565.1	533.4	20	50.80	685.8	292
20	508.0	857.2		107.9	247.6	508.0	622.3	584.2	20	53.80	749.3	362
24	609.6	1041.4		139.7	292. 1	609.6	749.3	692.1	20	66.55	901.7	665

Class 1500

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	120.6	To be specified by the Purchaser	22.30	60.45	21.30	38.10	35.00	4	22.30	82.50	1.87
3/4	26.70	130.0		25.40	69.85	26.70	44.00	42.90	4	22.30	88.90	2.56
1	33.40	149.3		28.40	73.15	33.50	52.30	50.80	4	25.40	101.6	3.74
11/4	42.20	158.7		28.40	73.15	42.20	63.50	63.50	4	25.40	111.2	4.33
11/2	48.30	177.8		31.70	82.50	48.30	69.85	73. 15	4	28.40	123.9	5.94
2	60.30	215.9		38.10	101.6	60.45	104.6	91.90	8	25.40	165.1	10.8
21/2	73.00	244.3		41.10	104.6	73.15	123.9	104.6	8	28.40	190.5	15.0
3	88.90	266.7		47.70	177.3	88.9	133.3	127.0	8	31.70	203.2	19.9
4	114.3	311.1		53.80	123.9	114.3	162.0	157.2	8	35.00	241.3	29.9
5	141.3	374.6		73.15	155.4	141.2	196.8	185.7	8	41.10	292.1	55.4
6	168.3	393.7		82.50	171.4	168.4	228.6	215.9	12	38.10	317.5	68.4
8	219.1	482.6		91.90	212.8	219.2	292.1	269.7	12	44.40	393.7	117
10	273.0	584.2		107.9	254.0	273.0	368.3	323.8	12	50.80	482.6	194
12	323.8	673. 1		123.9	282.4	323.8	450.8	381.0	16	53.80	571.5	288
14	355.6	749.3		133.3	298.4	355.6	495.3	412.7	16	60.45	635.0	380
16	406.4	825.5		146.0	311. 1	406.4	552.4	469.9	16	66.55	704.8	485
18	457.2	914.4		162.0	327.1	457.2	596.9	533.4	16	73.15	774.7	644
20	508.0	984.2		177.8	355.6	508.0	641.3	584.2	16	79.25	831.8	775
24	609.6	1168.4		203.2	406.4	609.6	762.0	692.1	16	91.90	990.6	1232

Class 2500 SS316 butt welded flange

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	133.4	To be specified by the Purchaser	30.20	73. 15	21.30	42.90	35.00	4	22.40	88.90	3.12
3/4	26.70	139.7		31.75	79.25	26.70	50.80	42.90	4	22.40	95.30	3.70
1	33.40	158.8		35.10	88.90	33.50	57.15	50.80	4	25.40	108.0	5.24
11/4	42.20	184.2		38.10	95.30	42.20	73.15	63.50	4	28.40	130.0	7.74
11/2	48.30	203.2		44.50	111.3	48.30	79.25	73.15	4	31.75	146. 1	10.9
2	60.30	235.0		50.80	127.0	60.45	95.30	91.90	8	28.40	171.5	16.2
21/2	73.00	266.7		57.15	142.7	73.15	114.3	104.6	8	31.75	196.9	23.7
3	88.90	304.8		66.55	168.1	88.90	133.4	127.0	8	35.10	228.6	36.2
4	114.3	355.6		76.20	190.5	114.3	165.1	157.2	8	41.10	273. 1	55.3
5	141.3	419.1		91.90	228.6	141.2	203.2	185.7	8	47.80	323.9	92.5
6	168.3	482.6		108	273.1	168.4	235.0	215.9	8	53.80	368.3	143
8	219.1	552.5		127.0	317.5	219.2	304.8	269.7	12	53.80	438.2	215
10	273.0	673.1		165.1	419.1	273.0	374.7	323.8	12	66.55	539.8	406
12	323.8	762.0		184.2	463.6	323.8	441.5	381.0	12	73.15	619.3	572