all instrument thread fittings are designed in accordance with asme b31.3 for instrument and process. male thread are protected with cap. burr-free internal and outside surfaces. npt threads are based on requirement of asme b1.20.1
material standards & temperature ratings
material
bar stock
forgings
temperature
ss316
astm a479
astm a276
astm a182
-325℉ -1200℉
(-198℃ -648℃)
brass
astm b16
astm b453
astm b283
-325℉ -400℉
(-198℃ -204℃)
carbon steel
astm a108
jis g4051
jis g4051
-20℉ -350℉
(-29℃ -176℃)
pressure ratings
pressure ratings listed are for temperature up to 37.8c (100°f). based on pressure pipe code asme b31.3 pressure rating is calculated with an allowable stress value of 20,000psi ss316, 10,000psi, brass 20,000psi, carbon steel. to determine the working pressure in accordance with power pipe code asme b31.1, multiply psig by 0.94. brass pressure ratings remain the same. due to larger outer diameter of female threads rating of female are lower than male threads. to determine kpa rating, multiply psig by 6.89. reducing hex bushing (p-shb) pressure rating is not covered in this table. see the pressure rating in the dimensional data chart.
