ASME/ANSI B16.5 Class 600 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	95	34.9	14.3	38	22	22.2	66.7	15.9	4	0.74
3/4	115	42.9	15.9	48	25	27.7	82.6	19.1	4	1.21
1	125	50.8	17.5	54	27	34.5	88.9	19.1	4	1.56
1 1/4	135	63.5	20.7	64	29	43.2	98.4	19.1	4	2.11
1 1/2	155	73.0	22.3	70	32	49.5	114.3	22.2	4	2.97
2	165	92.1	25.4	84	37	61.9	127.0	19.1	8	3.64
2 1/2	190	104.8	28.6	100	41	74.6	149.2	22.2	8	5.26
3	210	127.0	31.8	117	46	90.7	168.3	22.2	8	7.08
3 1/2	230	139.7	35.0	133	49	103.4	184.2	25.4	8	8.99
4	275	157.2	38.1	152	54	116.1	215.9	25.4	8	14.83
5	330	185.7	44.5	189	60	143.8	266.7	28.6	8	24.46
6	355	215.9	47.7	222	67	170.7	292.1	28.6	12	28.78
8	420	269.9	55.6	273	76	221.5	349.2	31.8	12	43.77
10	510	323.8	63.5	343	86	276.2	431.8	34.9	16	71.35
12	560	381.0	66.7	400	92	327.0	489.0	34.9	20	84.95
14	605	412.8	69.9	432	94	359.2	527.0	38.1	20	100.05
16	685	469.9	76.2	495	106	410.5	603.2	41.3	20	141.69
18	745	533.4	82.6	546	117	461.8	654.0	44.5	20	175.13
20	815	584.2	88.9	610	127	513.1	723.9	44.5	24	222.87
24	940	692.2	101.6	718	140	616.0	838.2	50.8	24	313.75

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