Historical
ANSI/ASME B16.12-1998
Cast Iron Threaded Drainage Fittings
Covers: (a) size and method of designating openings in reducing fittings; (b) marking; (c) materials; (d) dimensions and tolerances; (e) threading; (f) ribs; (g) coatings; and (h) face bevel.
American Society of Mechanical Engineers [asme]