A 1-1/2" Class 3000 threaded socket (often referred to as a threaded coupling or half-coupling) is a high-pressure forged fitting rated for up to 3000 PSI [\(0.5.2\), \(0.5.8\), \(0.5.14\)]. It is primarily used to connect, extend, or terminate 1-1/2" steel pipes in demanding industrial, hydraulic, and process piping systems.