A SOCKET is a connector used to screw two pieces of pipe together using threaded rings. Half-SOCKET are only threaded at one end. The other end is welded or otherwise fastened to the piping.
Specification
Size : 1/8' TO 4"
Class : 3000 1/8" to 4", 6000 ½" to 2", 9000 ½" to 2"
Material : MS A 105 Grade
Standard : ANSI B 16.11
Type : Socketweld and Screwded, in equal or reducing end.