ASME/ANSI B16.5 Class 900 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	Approxi-mate Weight kgs
NPS	O	R	tf	X	Y	B	W	I	n
1/2	120	34.9	22.3	38	32	22.2	82.6	22.2	4	1.73
3/4	130	42.9	25.4	44	35	27.7	88.9	22.2	4	2.33
1	150	50.8	28.6	52	41	34.5	101.6	25.4	4	3.48
1 1/4	160	63.5	28.6	64	41	43.2	111.1	25.4	4	4.00
1 1/2	180	73.0	31.8	70	44	49.5	123.8	28.6	4	5.54
2	215	92.1	38.1	105	57	61.9	165.1	25.4	8	9.79
2 1/2	245	104.8	41.3	124	64	74.6	190.5	28.6	8	13.82
3	240	127.0	38.1	127	54	90.7	190.5	25.4	8	11.51
4	290	157.2	44.5	159	70	116.1	235.0	31.8	8	19.52
5	350	185.7	50.8	190	79	143.8	279.4	34.9	8	32.14
6	380	215.9	55.6	235	86	170.7	317.5	31.8	12	41.04
8	470	269.9	63.5	298	102	221.5	393.7	38.1	12	70.97
10	545	323.8	69.9	368	108	276.2	469.9	38.1	16	100.32
12	610	381.0	79.4	419	117	327.0	533.4	38.1	20	133.26
14	640	412.8	85.8	451	130	359.2	558.8	41.3	20	152.57
16	705	469.9	88.9	508	133	410.5	616.0	44.5	20	185.15
18	785	533.4	101.6	565	152	461.8	685.8	50.8	20	256.28
20	855	584.2	108.0	622	159	513.1	749.3	54.0	20	315.13
24	1040	692.2	139.7	749	203	616.0	901.7	66.7	20	603.79

Note: 7 mm raised face regularly furnished on Classes 150 and 300 unless otherwise ordered.