ASME/ANSI B16.5 Class 150 TH

Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system.

It also provides easy access for cleaning, inspection or modification.

Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard.

Nominal Pipe Size	Outside Diameter of Flange	Diameter of Raised Face	Thickness of Flanges Min.	Diameter of Hub	Length Through Hub	Thread Length Threaded Min.	Bore	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Approximate Weight kgs
NPS	O	R	tf	X	Y	T	B	W	I	n
1/2	90	34.9	9.6	30	14	16	22.2	60.3	15.9	4	0.41
3/4	100	42.9	11.2	38	14	16	27.7	69.9	15.9	4	0.59
1	110	50.8	12.7	49	16	17	34.5	79.4	15.9	4	0.82
1 1/4	115	63.5	14.3	59	19	21	43.2	88.9	15.9	4	0.99
1 1/2	125	73.0	15.9	65	21	22	49.5	98.4	15.9	4	1.28
2	150	92.1	17.5	78	24	25	61.9	120.7	19.1	4	2.01
2 1/2	180	104.8	20.7	90	27	29	74.6	139.7	19.1	4	3.41
3	190	127.0	22.3	108	29	30	90.7	152.4	19.1	4	3.88
3 1/2	215	139.7	22.3	122	30	32	103.4	177.8	19.1	8	4.80
4	230	157.2	22.3	135	32	33	116.1	190.5	19.1	8	5.45
5	255	185.7	22.3	164	35	36	143.8	215.9	22.2	8	6.22
6	280	215.9	23.9	192	38	40	170.7	241.3	22.2	8	7.57
8	345	269.9	27.0	246	43	44	221.5	298.5	22.2	8	12.42
10	405	323.8	28.6	305	48	49	276.2	362.0	25.4	12	16.47
12	485	381.0	30.2	365	54	56	327.0	431.8	25.4	12	26.80
14	535	412.8	33.4	400	56	57	359.2	476.3	28.6	12	35.21
16	595	469.9	35.0	457	62	64	410.5	539.8	28.6	16	44.61
18	635	533.4	38.1	505	67	68	461.8	577.9	31.8	16	49.19
20	700	584.2	41.3	559	71	73	513.1	635.0	31.8	20	62.62
24	815	692.2	46.1	663	81	83	616.0	749.3	34.9	20	88.23