What is a sockolet (Socket Weld Outlet)?

What is a sockolet (Socket Weld Outlet)?

A Sockolet is the same basic design as a “weldolet” or “threadolet” where the major difference is that a Sockolet has a socket for welding versus a buttweld connection that a Weldolet has. This makes a 90° branch and comes in full size or reducing for a straight piece of pipe. Sockolets are available in Class 3000, 6000 and 9000 for high pressures.

What is the difference between a weldolet and a sockolet?

The weldolet and the sockolet both have a run end and a branch end. The run end connects to the larger diameter pipe, and the branch end connects to the smaller diameter pipe. The connection to the run pipe is a fillet weld for both the weldolet and the sockolet. They differ, however, at the connection to the branch pipe. The weldolet has a bevelled end to butt weld to the branch pipe (which will also have a bevelled end), whereas the sockolet has a socket into which a plain end branch pipe is inserted, then fillet welded together.

Dimensions Reducing Sockolets – MSS SP97

CLASS 3000

NPS	A	B	C	D	E
1/2	1 25.40	1.13/32 35.71	29/32 23.01	0.622 15.80	9/16 14.28
3/4	1.1/16 26.98	1.23/32 43.65	1.5/32 29.36	0.824 20.93	9/16 14.28
1	1.5/16 33.33	2 50.8	1.7/16 36.51	1.049 26.64	25/32 19.84
1¼	1.5/16 33.33	2.9/16 65.08	1.3/4 44.45	1.380 35.05	3/4 19.05
1½	1.3/8 34.92	2.27/32 72.23	2 50.8	1.610 40.89	3/4 19.05
2	1½ 38.1	3.15/32 88.10	2.9/16 65.08	2.067 52.50	13/16 20.63
2½	1.9/16 39.68	4.1/16 103.18	3 76.2	2.469 62.71	3/4 19.05
3	1.3/4 44.45	4.13/16 122.23	3.11/16 93.66	3.068 77.93	15/16 23.81
3½	1.11/16 42.86	5.3/8 136.52	4.7/16 112.71	3.548 90.12	11/16 17.46
4	1.7/8 47.62	5.31/32 151.60	4.3/4 120.65	4.026 102.26	1.1/16 26.98
5	2.5/8 66.67	7.5/16 185.73	5.9/16 141.28	5.047 128.19	1.11/32 34.13
6	2.3/4 69.85	8.5/8 219.07	6.11/16 169.86	6.065 154.05	1.13/32 35.71
			X = Min. 1/16 (1.6 mm)

CLASS 6000

NPS	A	B	C	D	E
1/2	1¼ 31.75	1.23/32 43.65	3/4 19.05	0.466 11.84	7/8 22.22
3/4	1.7/16 36.51	1.61/64 49.60	1 25.4	0.614 15.60	7/8 22.22
1	1.9/16 39.68	2.7/16 61.91	1.5/16 33.33	0.815 20.70	15/16 23.81
1¼	1.5/8 41.27	2.23/32 69.05	1½ 38.1	1.160 29.46	13/16 20.63
1½	1.11/16 42.86	3¼ 82.55	1.15/16 49.21	1.338 33.99	7/8 22.22
2	2.1/16 52.38	4.1/32 102.39	2.3/4 69.85	1.689 42.90	1.3/16 30.16
			X = Min. 1/16 (1.6 mm)

General notes:

• Dimensions: Top Row in Inches / Bottom Row in millimeters.
• Bottoming Clearance – X – The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal, and to allow for differential expansion of the mating elements.
• Socket dimensions are in accordance with ASME B16.11. Design per MSS SP-97.
• Source comes from Bonney Forge (except the sizes in millimeters).
• Sockolet® is a registered name. Another often used name is Socket Weld Outlet.

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