简介：
This STANDARD pertains primarily to cast class 125 and clas 250 bronze threaded pipe fittings.Certain requirements also pertain to wrounght to cast plugs,bushings,couplings,and caps.This STANDARD covers:
a)pressure-temperature ratings;
b)size and method of designating openings of reducing pipe fittings;
c)marking
d)minimum requirements for casting quality and materials
e)dimensions and tolerances in US customary and metric (SI) units
f)threading
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