ASME/ANSI B16.5 Class 300 SW

The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension. The counterbore is slightly larger than the O.D. of the matching pipe, allowing the pipe to be inserted into the flange similar to a slip-on flange.

The diamter of the smaller bore is the same as the I.D. of the matchine pipe A restriction is built into the bottom of the bore which sets as a shoulder for the pipe to rest on. This is eliminates any restriction in flow when using a socket welding flange.

Nominal Pipe Size	Outside Diameter of Flange	Diameter of Raised Face	Thickness of Flanges Min.	Diameter of Hub	Length Through Hub	Bore		Depth of Socket	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Approxi-mate Weight kgs
NPS	O	R	tf	X	Y	B1	B2	D	W	I	n
1/2	95	34.9	12.7	38	21	22.2	15.8	10	66.7	15.9	4	0.67
3/4	115	42.9	14.3	48	24	27.7	20.9	11	82.6	19.1	4	1.11
1	125	50.8	15.9	54	25	34.5	26.6	13	88.9	19.1	4	1.43
1 1/4	135	63.5	17.5	64	25	43.2	35.1	14	98.4	19.1	4	1.79
1 1/2	155	73.0	19.1	70	29	49.5	40.9	16	114.3	22.2	4	2.57
2	165	92.1	20.7	84	32	61.9	52.5	17	127.0	19.1	8	3.01
2 1/2	190	104.8	23.9	100	37	74.6	62.7	19	149.2	22.2	8	4.55
3	210	127.0	27.0	117	41	90.7	77.9	21	168.3	22.2	8	6.18