ASME B16.5 Threaded Flange Dimensions (150lb-2500lb)

ASME B16.5 Threaded Flange Dimensions

　　Threaded flanges are classified by pressure rating into Class 150, 300, 400, 600, 900, 1500, and 2500, with sizes ranging from 1/2” to 24” (DN15 to DN600). By precision machining the flange's inner bore into pipe threads, it directly screws into a threaded pipe to form a reliable sealing structure. This structure is a non-welded flange. Compared to slip-on or weld neck flanges, threaded flanges are easier to install and maintain, and can be used on pipelines where welding is not permitted in some field conditions. This structure eliminates the need for welding operations; the flange neck features a tapered design to enhance thread engagement strength, and thread specifications can be adapted to international mainstream standards as needed. However, it is recommended to avoid using threaded flanges in conditions of rapid pipeline temperature changes or temperatures above 260℃ or below -45℃ to prevent leakage.



ASME B16.5 Threaded Flange Class 150LBS 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