MSS SP-129-2021 PDF

This Standard Practice establishes requirements for copper-nickel fittings from Nominal Pipe Size (NPS) 1/4 through NPS 12 (or as noted), for use with pipe manufactured to one of the following standards:
MIL-T-16420K
ASTM B466/B466M
ASTM B467
Fitting types include long-radius elbows, short-radius elbows, 45° elbows, tees, reducing tees, long-turn single-sweep tees, long-turn double-sweep tees, crosses, 45° Y-laterals, couplings, reducing couplings, caps, pipe returns, inserts, adapters, plugs, and unions.
Fittings manufactured in accordance to this Standard Practice may be produced from castings, forgings, bar, pipe, tube, or plate by forming, machining, or a combination of the two.
Fittings manufactured in accordance to this Standard Practice may be produced with one or more NPT threaded-end configurations that properly adapt to a threaded pipe or to a threaded piping component.