Ratings, tolerances, characteristics, checks, and material requirements intended for use in the production of socket-welding and threaded forged fittings are covered by the ASME B16.11 Standard for Threaded Cap. These fittings are designated for pressure classes Class 2000, 3000, and 6000 for threaded end fittings and Alloy Steel Forged Screwed Pipe Cap and ASME B16.11 Threaded Cap. C... https://www.shasanpiping.com/threaded-pipe-cap-coupling-elbow-manufacturers-exporters-suppliers-stockists.html