ASME B16.5 Plate Flange Dimensions

ASME B16.5 – one of ASME’s more popular standards — covers pipe flanges and flanged fittings for flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24; plus flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12.

ASME B16.5 Plate Flange Class 150 LBS Dimensions
NPS	D	b	g	m	J	k	Holes	l	Kg.
1/2″	88.9	11.1	34.9	30.2	22.3	60.3	4	15.9	0.4
3/4″	98.4	12.7	42.9	38.1	27.7	69.8	4	15.9	0.7
1″	107.9	14.3	50.8	49.2	34.5	79.4	4	15.9	0.8
1 1/4″	117.5	15.9	63.5	58.8	43.2	88.9	4	15.9	1.1
1 1/2″	127	17.5	73	65.1	49.5	98.4	4	15.9	1.4
2″	152.4	19	92.1	77.8	62	120.6	4	19	2.2
2 1/2″	177.8	22.2	104.8	90.5	74.7	139.7	4	19	3.6
3″	190.5	23.8	127	107.9	90.7	152.4	4	19	4.1
3 1/2″	215.9	23.8	139.7	122.2	103.4	177.8	8	19	5.2
4″	228.6	23.8	157.2	134.9	116.1	190.5	8	19	5.6
5″	254	23.8	185.7	163.6	143.8	215.9	8	22.2	6.3
6″	279.4	25.4	215.9	192.1	170.7	241.3	8	22.2	7.5
8″	342.9	28.6	269.9	246.1	221.5	298.4	8	22.2	12.6
10″	406.4	30.2	323.8	304.8	276.3	361.9	12	25.4	18.5
12″	482.6	31.7	381	365.1	327.1	431.8	12	25.5	28
14″	533.4	34.9	412.7	400	359.1	476.2	12	28.6	36
16″	596.9	36.5	469.9	457.2	410.5	539.7	16	28.6	46
18″	635	39.7	533.4	504.8	461.8	577.8	16	31.7	50
20″	698.5	42.9	584.2	558.8	513.1	635	20	31.7	64
22″	749.3	46	641.2	609.6	564.4	692.1	20	34.9	72
24″	812.8	47.6	692.1	663.6	615.9	749.3	20	34.9	89

ASME B16.5 Plate Flange Class 300 LBS Dimensions
NPS	D	b	g	m	J	k	Holes	l	Kg.
1/2″	95.6	14.3	34.9	38.1	22.3	66.7	4	15.9	0.7
3/4″	117.5	15.9	42.9	47.6	27.7	82.5	4	19	1.1
1″	123.8	17.5	50.8	54	34.5	88.9	4	19	1.4
1 1/4″	133.3	19	63.5	63.5	43.2	98.4	4	19	1.8
1 1/2″	155.6	20.6	73	69.8	49.5	114.3	4	22.2	2.6
2″	165.1	22.2	92.1	84.1	62	127	8	19	3.4
2 1/2″	190.5	25.4	104.8	100	74.7	149.2	8	22.2	4.4
3″	209.5	28.6	127	117.5	90.7	168.3	8	22.2	6.1
3 1/2″	228.6	30.2	139.7	133.3	103.4	184.1	8	22.2	7.5
4″	254	31.7	157.2	146	116.1	200	8	22.2	10.1
5″	279.4	34.9	185.7	177.8	143.8	234.9	8	22.2	12.5
6″	317.5	36.5	215.9	206.4	170.7	269.9	12	22.2	14.1
8″	381	41.3	269.9	260.3	221.5	330.2	12	25.4	24.8
10″	444.5	47.6	323.8	320.7	276.3	387.3	16	28.6	37.1
12″	520.7	50.8	381	374.6	327.1	450.8	16	31.7	50
14″	584.2	54	412.7	425.4	359.1	514.3	20	31.7	70
16″	647.7	57.1	469.9	482.6	410.5	571.5	20	34.9	90
18″	711.2	60.3	533.4	533.4	461.8	628.6	24	34.9	112
20″	774.7	63.5	584.2	584.2	513.1	685.8	24	34.9	133
22″	838.2	66.7	641.2	641.2	564.4	742.9	24	41.3	197
24″	914.4	69.8	692.1	701.7	615.9	812.8	24	41.3	208

ASME B16.5 Plate Flange Class 600 LBS Dimensions
NPS	D	b	g	m	J	k	Holes	l	Kg.
1/2″	95.2	14.3	34.9	38.1	22.3	66.7	4	15.9	0.8
3/4″	117.5	15.9	42.9	47.6	27.7	82.5	4	19	1.4
1″	123.8	17.5	50.8	54	34.5	88.9	4	19	1.6
1 1/4″	133.3	20.6	63.5	63.5	43.2	98.4	4	19	2.1
1 1/2″	155.6	22.2	73	69.8	49.5	114.3	4	22.2	3.1
2″	165.1	25.4	92.1	84.1	62	127	8	19	3.7
2 1/2″	190.5	28.6	104.8	100	74.7	149.2	8	22.2	5.4
3″	209.5	31.7	127	117.5	90.7	168.3	8	22.2	7.3
3 1/2″	228.6	34.9	139.7	133.3	103.4	184.1	8	25.4	8.9
4″	273	38.1	157.2	152.4	116.1	215.9	8	25.4	11.8
5″	330.2	44.4	185.7	188.9	143.8	266.7	8	28.6	24.5
6″	355.6	47.6	215.9	222.2	170.7	292.1	12	28.6	29.5
8″	419.1	55.6	269.9	273	221.5	349.2	12	31.7	43
10″	508	63.5	323.8	342.8	276.3	431.8	16	34.9	70
12″	558.8	66.7	381	400	327.1	488.9	20	34.9	86
14″	603.2	69.8	412.7	431.8	359.1	527	20	38.1	100
16″	685.8	76.2	469.9	495.3	410.5	603.2	20	41.3	142
18″	742.9	82.5	533.4	546.1	461.8	654	20	44.4	175
20″	812.8	88.9	584.2	609.6	513.1	723.9	24	44.4	232
22″	869.9	95.2	641.2	666.7	564.4	777.9	24	47.6	292
24″	939.8	101.6	692.1	717.5	615.9	838.2	24	50.8	330