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Technical Reference

Thread Identification

Quick reference tables for identifying and measuring hydraulic thread types used across the industry.

NPT & NPSM

ANSI/ASME B1.20.1-1983

National Pipe Taper & National Pipe Straight Mechanical

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BSPP & BSPT

DIN 3852-1+2, ISO 1179-1

British Standard Pipe Parallel & Taper

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JIC 37° Flare & UNO

SAE J514, ISO 8434-2, SAE J1926

Joint Industry Council & Unified National O-Ring Boss

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Note: Thread size refers to the nominal bore of the pipe. Subtract approx. ¼″ (6mm) from thread diameter measurement for nominal pipe size.