Threaded Fittings Threaded Fittings Stainless Steel Threaded Fittings are manufactured according to ASTM A351/351MAvailable in grades SS304 and SS316Pressure Rating available in 150LB and 3000LBAvailable in Threaded Type (BSP/NPT) and Socket Weld Type (SW)Type Ranges from Nipples, Unions, Sockets/Couplings, Elbows, Reducing Adapters, Etc. Download Brochure - CAST 150LB fittings Download Brochure - FORGED 3000LB fittings