NPSM straight pipe thread ring gages and set plugs are manufactured per ANSI/ASME B1.20.1. NPSM straight pipe thread plug gages are manufactured per ANSI/ASME B1.20.1. All straight pipe thread gages are supplied in a class 2A for rings and set plugs and 2B for working thread plug gages. NPSF straight pipe thread plug gages and ring gages are manufactured per ANSI/ASME B1.20.5. Other straight pipe thread gages include NPSC, NPSL, NPSH, and NH sizes.
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