ASME B16.5 Threaded Flange Dimension

ASME B16.5 Threaded flange is a kind of pipe connection flange with internal threaded holes, mainly through screwing connection with external threaded pipes to realize sealing and fixing without welding. Threaded flange pressure is divided into seven grades: 150#, 300#, 400#, 600#, 900#, 1500#, 2500#.This article focuses on the ASME B16.5 threaded flange dimension for each pressure class.

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TH Flange Class 150 lb

Threaded Flange Dimensions Class 150 (ASME B16.5 ) in Millimeters.

Nominal Pipe Size		A	C	D	E	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.30	88.90	11.20	15.70	15.70	30.20	35.10	4	15.70	60.45	0.39
3/4	26.70	98.60	12.70	15.70	15.70	38.10	42.90	4	15.70	69.85	0.56
1	33.40	108.0	14.20	17.50	17.50	49.30	50.80	4	15.70	79.25	0.78
11/4	42.20	117.3	15.70	20.60	20.60	58.70	63.50	4	15.70	88.90	1.03
11/2	48.30	127.0	17.50	22.40	22.30	65.00	73.15	4	15.70	98.60	1.32
2	60.30	152.4	19.10	25.40	25.40	77.70	91.90	4	19.10	120.7	2.06
21/2	73.00	177.8	22.40	28.40	28.40	90.40	104.6	4	19.10	139.7	3.28
3	88.90	190.5	23.90	30.20	30.20	108.0	127	4	19.10	152.4	3.85
31/2	101.60	215.9	23.90	31.75	31.75	122.2	139.7	8	19.10	177.8	4.81
4	114.30	228.6	23.90	33.30	33.30	134.9	157.2	8	19.10	190.5	5.3
5	141.30	254.0	23.90	36.60	36.60	163.6	185.7	8	22.40	215.9	6.07
6	168.30	279.4	25.40	39.60	39.60	192.0	215.9	8	22.40	241.3	7.45
8	219.10	342.9	28.40	44.50	44.50	246.1	269.7	8	22.40	298.5	12.1
10	273.00	406.4	30.20	49.30	49.30	304.8	323.9	12	25.40	362.0	16.5
12	323.80	482.6	31.75	55.60	55.60	365.3	381.0	12	25.40	431.8	26.2
14	355.60	533.4	35.10	57.15	57.15	400.1	412.7	12	28.40	476.3	34.6
16	406.40	596.9	36.60	63.50	63.50	457.2	469.9	16	28.40	539.8	44.8
18	457.20	635	39.60	68.30	68.30	505.0	533.4	16	31.75	577.9	48.9
20	508.00	698.5	42.90	73.15	73.15	558.8	584.2	20	31.75	635.0	61.9
24	609.60	812.8	47.80	82.60	82.60	663.4	692.2	20	35.10	749.3	86.9

TH Flange Class 300 lb

Threaded Flange Dimensions Class 300 (ASME B16.5 ) in Millimeters.

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	23.60	14.20	22.30	15.70	38.10	35.00	4	15.70	66.55	0.64
3/4	26.70	117.3	29.00	15.70	25.40	15.70	47.70	42.90	4	19.00	82.50	1.12
1	33.40	123.9	35.80	17.50	26.90	17.50	53.80	50.80	4	19.00	88.90	1.36
11/4	42.20	133.3	44.40	19.00	26.90	20.60	63.50	63.50	4	19.00	98.50	1.68
11/2	48.30	155.4	50.50	20.60	30.20	22.30	69.85	73. 15	4	22.30	114.3	2.49
2	60.30	165.1	63.50	22.30	33.20	28.40	84.00	91.90	8	19.00	127.0	2.87
21/2	73.00	190.5	76.20	25.40	38. 10	31.70	100.0	104.6	8	22.30	149.3	4.32
3	88.90	209.5	92.20	28.40	42.90	31.70	117.3	127.0	8	22.30	168.1	5.85
31/2	101.6	228.6	104.9	30.20	44.40	36.50	133.3	139.7	8	22.30	184.1	7.34
4	114.3	254.0	117.6	31.70	47.70	36.50	146.0	157.2	8	22.30	200.1	9.61
5	141.3	279.4	144.5	35.00	50.80	42.90	177.8	185.7	8	22.30	234.9	12.3
6	168.3	317.5	171.4	36.50	52.30	45.90	206.2	215.9	12	22.30	269.7	15.6
8	219.1	381.0	222.2	41.10	61.90	50.80	260.3	269.7	12	25.40	330.2	24.2
10	273.0	444.5	276.3	47.70	66.55	55.60	320.5	323.9	16	28.40	387.3	34.1
12	323.8	520.7	328.7	50.80	73. 15	60.45	374.6	381.0	16	31.70	450.8	49.8
14	355.6	584.2	360.4	53.80	76.20	63.50	425.4	412.7	20	31.70	514.3	69.9
16	406.4	647.7	411.2	57.15	82.50	68.30	482.6	469.9	20	35.00	571.5	88.1
18	457.2	711.2	462.0	60.45	88.90	69.85	533.4	533.4	24	35.00	628.6	109
20	508.0	774.7	512.8	63.50	95.20	73.15	587.2	584.2	24	35.00	685.8	134
24	609.6	914.4	614.4	69.85	106.4	82.50	701.5	692.2	24	41.10	812.8	201

TH Flange Class 400 lb

Threaded Flange Dimensions Class 400 (ASME B16.5 ) in Millimeters.

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	23.60	14.20	22.40	15.70	38.10	35.10	4	15.70	66.55	0.74
3/4	26.70	117.3	29.00	15.70	25.40	15.70	47.80	42.90	4	19.10	82.60	1.27
1	33.40	124.0	35.80	17.50	26.90	17.50	53.80	50.80	4	19.10	88.90	1.52
11/4	42.20	133.4	44.50	20.60	28.40	20.60	63.50	63.50	4	19.10	98.60	2.03
11/2	48.30	155.4	50.50	22.40	31.75	22.40	69.85	73.15	4	22.40	114.3	2.96
2	60.30	165.1	63.50	25.40	36.60	28.40	84.10	91.90	8	19.10	127.0	3.62
21/2	73.00	190.5	76.20	28.40	41.10	31.75	100.1	104.6	8	22.40	149.4	5.28
3	88.90	209.6	92.20	31.75	46.00	35.10	117.3	127.0	8	22.40	168. 1	7.00
31/2	101.6	228.6	104.9	35.10	49.30	39.60	133.4	139.7	8	25.40	184.2	8.84
4	114.3	254.0	117.6	35.10	50.80	36.60	146.1	157.2	8	25.40	200.2	11.1
5	141.3	279.4	144.5	38.10	53.80	42.90	177.8	185.7	8	25.40	235.0	13.9
6	168.3	317.5	171.5	41.10	57.15	46.00	206.2	215.9	12	25.40	269.7	18.3
8	219.1	381.0	222.3	47.80	68.30	50.80	260.4	269.7	12	28.40	330.2	28.6
10	273.0	444.5	276.4	53.80	73.15	55.60	320.5	323.9	16	31.75	387.4	39.2
12	323.8	520.7	328.7	57.15	79.25	60.45	374.7	381.0	16	35.10	450.9	57.0
14	355.6	584.2	360.4	60.45	84.10	63.50	425.5	412.8	20	35.10	514.4	79.1
16	406.4	647.7	411.2	63.50	93.70	68.30	482.6	469.9	20	38.10	571.5	101
18	457.2	711.2	462.0	66.55	98.60	69.85	533.4	533.4	24	38.10	628.7	123
20	508.0	774.7	512.8	69.85	101.6	73.15	587.2	584.2	24	41.10	685.8	146
24	609.6	914.4	614.4	76.20	114.3	82.60	701.5	692.2	24	47.80	812.8	219

TH Flange Class 600 lb

Threaded Flange Dimensions Class 600 (ASME B16.5 ) in Millimeters.

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	23.60	14.20	22.40	15.70	38.10	35. 10	4	15.70	66.55	0.74
3/4	26.70	117.3	29.00	15.70	25.40	15.70	47.80	42.90	4	19. 10	82.60	1.27
1	33.40	124.0	35.80	17.50	26.90	17.50	53.80	50.80	4	19. 10	88.9	1.52
11/4	42.20	133.4	44.50	20.60	28.40	20.60	63.50	63.50	4	19. 10	98.60	2.03
11/2	48.30	155.4	50.50	22.40	31.75	22.40	69.85	73. 15	4	22.40	114.3	2.96
2	60.30	165.1	63.50	25.40	36.60	28.40	84.10	91.90	8	19. 10	127.0	3.62
21/2	73.00	190.5	76.20	28.40	41.10	31.75	400. 1	104.6	8	22.40	149.4	5.28
3	88.90	209.6	92.20	31.75	46.00	35. 10	117.3	127.0	8	22.40	168.1	7.00
31/2	101.6	228.6	104.9	35.10	49.30	39.60	133.4	139.7	8	25.40	184.2	8.84
4	114.3	273.1	117.6	38.10	53.80	41. 10	152.4	157.2	8	25.40	215.9	14.5
5	141.3	330.2	144.5	44.50	60.45	47.80	189.0	185.7	8	28.40	266.7	24.4
6	168.3	355.6	171.5	47.80	66.55	50.80	222.3	215.9	12	28.40	292.1	28.7
8	219.1	419.1	222.3	55.60	76.20	57. 15	273. 1	269.7	12	31.75	349.3	43.4
10	273.0	508.0	276.4	63.50	85.90	65.00	342.9	323.9	16	35. 10	431.8	70.3
12	323.8	558.8	328.7	66.55	91.90	69.85	400. 1	381.0	20	35. 10	489.0	84.2
14	355.6	603.3	360.4	69.85	93.70	73. 15	431.8	412.8	20	38. 10	527.1	98.7
16	406.4	685.8	411.2	76.20	106.4	77.70	495.3	469.9	20	41. 10	603.3	142
18	457.2	743.0	462.0	82.60	117.3	79.25	546. 1	533.4	20	44.50	654.1	173
20	508.0	812.8	512.8	88.90	127.0	82.60	609.6	584.2	24	44.50	723.9	220
24	609.6	939.8	614.4	101.6	139.7	91.90	717.6	692.2	24	50.80	838.2	312

TH Flange Class 900 lb

Threaded Flange Dimensions Class 900 (ASME B16.5 ) in Millimeters.

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	23.60	22.30	31.70	22.30	38.10	35.10	4	22.30	82.5	1.74
3/4	26.70	130.0	29.00	25.40	35.00	25.40	44.40	42.90	4	22.30	88.9	2.34
1	33.40	149.3	35.80	28.40	41.10	28.40	52.30	50.80	4	25.40	101.6	3.44
11/4	42.20	158.7	44.40	28.40	41.10	30.20	63.50	63.50	4	25.40	111.2	3.91
11/2	48.30	177.8	50.50	31.70	44.50	31.70	69.85	73.15	4	28.40	123.9	5.36
2	60.30	215.9	63.50	38.10	57.15	38.10	104.6	91.90	8	25.40	165. 1	9.85
21/2	73.00	244.3	76.20	41.10	63.50	47.70	123.9	104.6	8	28.40	190.5	13.7
3	88.90	241.3	92.20	38.10	53.80	41.10	127.0	127.0	8	25.40	190.5	11.6
4	114.3	292.1	117.6	44.40	69.85	47.80	158.7	157.2	8	31.70	234.9	19.7
5	141.3	349.2	144.5	50.80	79.25	53.80	190.5	185.7	8	35.00	279.4	31.9
6	168.3	381.0	171.4	55.60	85.80	57.15	234.9	215.9	12	31.70	317.5	41.1
8	219.1	469.9	222.2	63.50	101.6	63.50	298.4	269.7	12	38.10	393.7	70.7
10	273.0	546.1	276.3	69.85	107.9	71.40	368.3	323.9	16	38.10	469.9	101
12	323.8	609.6	328.7	79.40	117.3	76.20	419.1	381.0	20	38.10	533.4	133
14	355.6	641.3	360.4	85.70	130.0	82.50	450.8	412.7	20	41.10	558.8	153
16	406.4	704.8	411.2	88.90	133.3	85.90	508.0	469.9	20	44.40	618.9	185
18	457.2	787.4	462.0	101.6	152.4	88.90	565.1	533.4	20	50.80	685.8	258
20	508.0	857.2	512.8	107.9	158.7	91.90	622.3	584.2	20	53.80	749.3	317
24	609.6	1041.4	614.4	139.7	203.2	101.6	749.3	692.2	20	66.55	901.7	606

TH Flange Class 1500 lb

Threaded Flange Dimensions Class 1500 (ASME B16.5 ) in Millimeters.

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	23.60	22.30	31.70	22.30	38.10	35.00	4	22.30	82.50	1.74
3/4	26.70	130.0	29.00	25.40	35.00	25.40	44.40	42.90	4	22.30	88.90	2.34
1	33.40	149.3	35.80	28.40	41. 10	28.40	52.30	50.80	4	25.40	101.6	3.44
11/4	42.20	158.7	44.40	28.40	41. 10	30.20	63.50	63.50	4	25.40	111.2	3.91
11/2	48.30	177.8	50.50	31.70	44.50	31.70	69.85	73. 15	4	28.40	123.9	5.36
2	60.30	215.9	63.50	38.10	57. 15	38.10	104.6	91.90	8	25.40	165.1	9.85
21/2	73.00	244.3	76.20	41.10	63.50	47.70	123.9	104.6	8	28.40	190.5	13.7

TH Flange Class 2500 lb

Threaded Flange Dimensions Class 2500 (ASME B16.5 ) in Millimeters.

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	23.60	30.20	39.60	28.40	42.90	35.10	4	22.40	88.90	2.95
3/4	26.70	139.7	29.00	31.75	42.90	31.75	50.80	42.90	4	22.40	95.30	3.44
1	33.40	158.8	35.80	35. 10	47.80	35.10	57.15	50.80	4	25.40	108	4.82
11/4	42.20	1.842	44.50	38. 10	52.30	38.10	73.15	63.50	4	28.40	130	7.14
11/2	48.30	203.2	50.50	44.50	60.45	44.50	79.25	73.15	4	31.75	146.1	10.0
2	60.30	235.0	63.50	50.80	69.85	50.80	95.30	91.90	8	28.40	171.5	14.8
21/2	73.00	266.7	76.20	57. 15	79.25	57.15	114.3	104.6	8	31.75	196.9	21.5