ASME B16.11
Socket Weld Fittings
Socket weld fittings take the pipe into a socket and are fillet-welded. They are used on small-bore, high-pressure lines, usually 2" and under.
- ASME B16.11
- NPS ⅛" – 4"
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
Socket Weld Fittings types
ElbowA fitting that changes the direction of a pipe run.TeeA fitting with a 90° branch that splits or combines flow.CapA fitting that closes the end of a pipe.CrossA four-way fitting with branches at 90°.CouplingA short forged fitting that joins two pipes.UnionA three-piece forged fitting that joins pipes and can be taken apart.NippleA short length of pipe, threaded or plain, used to connect fittings.PlugA threaded fitting that closes a female connection.
Socket Weld Fittings by grade
Socket Weld Fittings — questions buyers ask
What sizes are socket weld fittings made in?
NPS ⅛" – 4", Class 3000 / 6000 / 9000.
Which standard covers socket weld fittings?
ASME B16.11 for dimensions; the material standard depends on the grade — for example ASTM A403 for stainless, A815 for duplex and B366 for nickel alloys.
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