ASME B16.5 Threaded Flange Dimensions

Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection. Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.

ASME B16.5 Threaded Flange Class 150/300LBS Dimensions

ASME B16.5 Threaded Flange Class 150LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	89	19.85	15.7	4	11.2	15.7	30.2	35.1	0.41
3/4″	99	25.25	15.7	4	12.7	15.7	38.1	42.9	0.59
1″	108	31.63	15.7	4	14.2	17.5	49.3	50.8	0.8
1-1/4″	117	40.43	15.7	4	15.7	20.6	58.7	63.5	1.04
1-1/2″	127	46.53	15.7	4	17.5	22.4	65	73.2	1.37
2″	152	58.53	19.1	4	19.1	25.4	77.7	91.9	2.12
2-1/2″	178	70.46	19.1	4	22.4	28.4	90.4	104.6	3.42
3″	191	86.36	19.1	4	23.9	30.2	108	127	4.04
3-1/2″	216	99.06	19.1	8	23.9	31.8	122.2	139.7	5.01
4″	229	111.76	19.1	8	23.9	33.3	134.9	157.2	5.54
5″	254	138.76	22.4	8	23.9	36.6	163.6	185.7	6.41
6″	279	165.76	22.4	8	25.4	39.6	192	215.9	7.81
8″	343	216.56	22.4	8	28.4	44.5	246.1	269.7	12.64
10″	406	270.46	25.4	12	30.2	49.3	304.8	323.9	17.44
12″	483	321.26	25.4	12	31.8	55.6	365.3	381	27.63
14″	533	353.06	28.4	12	35.1	57.2	400.1	412.8	36.21
16″	597	403.86	28.4	16	36.6	63.5	457.2	469.9	47.11
18″	635	454.66	31.8	16	39.6	68.3	505	533.4	51.56
20″	699	505.46	31.8	20	42.9	73.2	558.8	584.2	65.66
24″	813	607.06	35.1	20	47.8	82.6	663.4	692.2	92.73

ASME B16.5 Threaded Flange Class 300LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	95	19.85	15.7	4	14.2	22.4	38.1	35.1	0.66
3/4″	117	25.25	19.1	4	15.7	25.4	47.8	42.9	1.12
1″	124	31.63	19.1	4	17.5	26.9	53.8	50.8	1.39
1-1/4″	133	40.43	19.1	4	19.1	26.9	63.5	63.5	1.71
1-1/2″	155	46.53	22.4	4	20.6	30.2	69.9	73.2	2.52
2″	165	58.53	19.1	8	22.1	33.3	84.1	91.9	2.94
2-1/2″	191	70.46	22.4	8	25.4	38.1	100.1	104.6	4.49
3″	210	86.36	22.4	8	28.4	42.9	117.3	127	6.04
3-1/2″	229	99.06	22.4	8	30.2	44.5	133.4	139.7	7.61
4″	254	111.76	22.4	8	31.8	47.8	146.1	157.2	9.93
5″	279	138.76	22.4	8	35.1	50.8	177.8	185.7	12.62
6″	318	165.76	22.4	12	36.6	52.6	206.2	215.9	16.27
8″	381	216.56	25.4	12	41.1	62	260.4	269.7	24.99
10″	445	270.46	28.4	16	47.8	66.5	320.5	323.9	35.62
12″	521	321.26	31.8	16	50.8	73.2	374.7	381	51.67
14″	584	353.06	31.8	20	53.8	76.2	425.5	412.8	71.38
16″	648	403.86	35.1	20	57.2	82.6	482.6	469.9	91.08
18″	711	454.66	35.1	24	60.5	88.9	533.4	533.4	112.16
20″	775	505.46	35.1	24	63.5	95.3	587.2	584.2	138.79
24″	914	607.06	41.1	24	69.9	106.4	701.5	692.2	208.43

ASME B16.5 Threaded Flange Class 400-2500LBS Dimensions

ASME B16.5 Threaded Flange Class 400LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	95	19.85	16	4	14.2	22.4	38.1	34.9	0.75
3/4″	117	25.25	19	4	15.7	25.4	47.8	42.9	1.27
1″	124	31.63	19	4	17.5	26.9	53.8	50.8	1.57
1-1/4″	133	40.43	19	4	20.6	28.4	63.5	63.5	2.06
1-1/2″	155	46.53	22	4	22.4	31.8	69.9	73	3.03
2″	165	58.53	19	8	25.4	36.8	84.1	92.1	3.73
2-1/2″	191	70.46	22	8	28.4	41.1	100.1	104.8	5.47
3″	210	86.36	22	8	31.8	46	117.3	127	7.32
3-1/2″	229	99.06	25	8	35.1	49.3	133.4	139.7	9.22
4″	254	111.76	25	8	35.1	50.8	146.1	157.2	11.51
5″	279	138.76	25	8	38.1	53.8	177.8	185.7	14.38
6″	318	165.76	25	12	41.1	57.2	206.2	215.9	19
8″	381	216.56	29	12	47.8	68.3	260.4	269.9	29.64
10″	445	270.46	32	16	55.8	73.2	320.5	323.8	41.74
12″	521	321.26	35	16	57.2	79.2	374.7	381	59.1
14″	584	353.06	35	20	60.5	84.1	425.5	412.8	81.58
16″	648	403.86	39	20	63.5	93.7	482.6	469.9	103.88
18″	710	454.66	39	24	66.5	98	533.4	533.4	125.12
20″	775	505.46	42	24	69.9	101.6	587.2	584.2	151.31
24″	914	607.06	48	24	76.2	114.3	701.5	692.2	226.72

ASME B16.5 Threaded Flange Class 600LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	95	19.85	15.7	4	14.2	22.4	38.1	35.1	0.76
3/4″	117	25.25	19.1	4	15.7	25.4	47.8	42.9	1.27
1″	124	31.63	19.1	4	17.5	26.9	53.8	50.8	1.57
1-1/4″	133	40.43	19.1	4	20.6	28.4	63.5	63.5	2.06
1-1/2″	155	46.53	22.4	4	22.4	31.8	69.9	73.2	3.02
2″	165	58.53	19.1	8	25.4	36.6	84.1	91.9	3.72
2-1/2″	191	70.46	22.4	8	28.4	41.1	100.1	104.6	5.45
3″	210	86.36	22.4	8	31.8	46	117.3	127	7.29
3-1/2″	229	99.06	25.4	8	35.1	49.3	133.4	139.7	9.19
4″	273	111.76	25.4	8	38.1	53.8	152.4	157.2	14.88
5″	330	138.76	28.4	8	44.5	60.5	189	185.7	25.05
6″	356	165.76	28.4	12	47.8	66.5	222.3	215.9	29.68
8″	419	216.56	31.8	12	55.6	76.2	273.1	269.7	44.47
10″	508	270.46	35.1	16	63.5	85.9	342.9	323.9	72.06
12″	559	321.26	35.1	20	66.5	91.9	400.1	381	86.25
14″	603	353.06	38.1	20	69.9	93.7	431.8	412. 8	101.33
16″	686	403.86	41.1	20	76.2	106.4	495.3	469.9	146.16
18″	743	454.66	44.5	20	82.6	117.3	546.1	533.4	178.32
20″	813	505.46	44.5	24	88.9	127	609.6	584.2	226.83
24″	940	607.06	50.8	24	101.6	139.7	717.6	692.2	322.58

ASME B16.5 Threaded Flange Class 900LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	121	19.85	23	4	22.4	31.3	38.1	34.9	1.77
3/4″	130	25.25	23	4	25.4	35.1	44.5	42.9	2.34
1″	149	31.63	26	4	28.4	41.1	52.3	50.8	3.44
1-1/4″	159	40.43	26	4	28.4	41.1	63.5	63.5	3.95
1-1/2″	178	46.53	29	4	31.8	44.5	69.9	73	5.46
2″	216	58.53	26	8	38.1	57.2	104.6	92.1	9.97
2-1/2″	244	70.46	29	8	41.1	63.5	124	104.8	13.8
3″	241	86.36	26	8	38.1	53.8	127	127	11.8
4″	292	111.76	32	8	44.5	69.9	158.8	157.2	20.19
5″	349	138.76	35	8	50.8	79.2	190.5	185.7	32.63
6″	381	165.76	32	12	55.6	85.9	235	215.9	42.06
8″	470	216.56	39	12	63.5	101.6	298.5	269.9	71.91
10″	546	270.46	39	16	69.9	108	368.3	323.8	102.39
12″	610	321.26	39	20	79.2	117.3	419.1	381	135.1
14″	641	353.06	42	20	85.9	130	450.9	412.8	156.08
16″	705	403.86	45	20	88.9	133.4	508	46 9.9	189.14
18″	787	454.66	51	20	101.6	152.4	565.2	533.4	264.26
20″	857	505.46	54	20	108	158.8	622.3	584.2	324.72
24″	1041	607.06	67	20	139.7	203.2	749.3	692.2	618.5

ASME B16.5 Threaded Flange Class 1500LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	121	19.85	23	4	22.4	31.8	38.1	34.9	1.77
3/4″	130	25.25	23	4	25.4	35.1	44.5	42.9	2.34
1″	149	31.63	26	4	28.4	41.1	52.3	50.8	3.44
1-1/4″	159	40.43	26	4	28.4	41.1	63.5	63.5	3.95
1-1/2″	178	46.53	29	4	31.3	44.5	69.9	73	5.39
2″	216	58.53	26	8	38.1	57.2	104.6	92.1	9.97
2-1/2″	244	70.46	29	8	41.1	63.5	124	104.3	13.79
3″	267	86.36	32	8	47.3	73.2	133.4	127	18.22
4″	311	111.76	35	8	53.8	90.4	162.1	157.2	28.28
5″	375	138.76	42	8	73.2	104.6	196.9	185.7	52.78
6″	394	165.76	39	12	82.6	119.1	228.6	215.9	62.09
8″	483	216.56	45	12	91.9	142.7	292.1	269.9	104.89
10″	584	270.46	51	12	108	158.8	368.3	323.8	178.42
12″	673	321.26	54	16	124	180.8	450.9	381	268.39
14″	749	353.06	61	16	133.4	–	495.3	412.8	–
16″	826	403.86	67	16	146.1	–	552.5	469.9	–
18″	914	454.66	74	16	162.1	–	596.9	533.4	–
20″	984	505.46	80	16	177.8	–	641.4	584.2	–
24″	1168	607.06	93	16	203.2	–	762	692.2	–

ASME B16.5 Threaded Flange Class 2500LBS Dimensions
NPS	A	B	I	Holes	C	D	F	G	Weight
1/2″	133	19.85	23	4	30.2	39.6	42.9	34.9	2.94
3/4″	140	25.25	23	4	31.8	42.9	50.8	42.9	3.48
1″	159	31.63	26	4	35.1	47.8	57.2	50.8	4.91
1-1/4″	184	40.43	29	4	38.1	52.3	73.2	63.5	7.2
1-1/2″	203	46.53	32	4	44.5	60.5	79.2	73	10.12
2″	235	58.53	29	8	50.8	69.9	95.3	92.1	14.98
2-1/2″	267	70.46	32	8	57.2	79.2	114.3	104.8	21.84
3″	305	86.36	35	8	66.5	91.9	133.4	127	33.02
4″	356	111.76	42	8	76.8	108	165.1	157.2	50.73
5″	419	138.76	48	8	91.5	130	203.2	185.7	83.61
6″	483	165.76	54	8	108	152.4	235	215.9	129.85
8″	552	216.56	54	12	127	177.8	304.8	269.9	189.89
10″	673	270.46	67	12	165.1	228.6	374.7	323.8	359.32
12″	762	321.26	74	12	184.2	254	441.5	381	508.69

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