ASME/ANSI B16.5 Class 150 SO

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide suffcient strength and prevent leakage.

 Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.

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