ASME B16.15-2006 pdf download.Cast Copper Alloy Threaded Fittings Classes 125 and 250. 6 ThREADING 6.1 Types of Threads All pipe fittings shall be threaded with ANSI! ASME 81.20.1 general purpose pipe threads and shall have taper threads, except wrought couplings (Tables 2 and 1-2), wrought caps (Tables 3 and 1-3), and wrought bushings (Tables 4 and 1-4) in NPS 5,...