Socket-weld fittings are a type of pipe fittings, which are machined pipe connections forged from stainless steel round bars or ingots.

Its connection type is socket welding (SW), which involves inserting steel pipes into the socket and welding them. The main manufacturing standards are ANSI/ASME B16.11, HG/T 21634, MSS SP-83, MSS SP 79, and GB/T 14383-2008.

The types of stainless steel socket and spigot fittings include 45° elbows, 90° elbows, tees, crosses, 45° reducing tees, double-end socket ferrules, single-end socket ferrules, pipe caps, quick couplings, and branch supports, etc. Among them, tees and crosses come in both equal and unequal diameters; similarly, double-end socket ferrules also come in equal and unequal diameters, with variations in concentric and eccentric designs.