Description

This American National Standard covers dimensions and gaging of the world’s most common pipe threads: NPT, NPSC, NPTR, NPSM, and NPSL.

These threads are used everywhere in the United States and abroad.

Scope

This revision incorporates both subtle and substantive changes, including:

• Moving of the gaging point of reference of external threads in certain circumstances;
• A new acceptability section for instances of gaging disputes;
• A change to parameters, facilitating the calibration of working gages;
• Guidance for plated or coated pipe threads;
• Better explanatory language for the lay-user.

This is the foundational Standard for NPT, NPSC, NPSM, and NPSL pipe threads.

All companies that manufacture, sell, or use these threads should have this revision in their technical library.