HEMCOChrome™ Process- unconditionally guaranteed against chipping

All gages conform to ANSI B47.1

L1 Plug classifies the thread as to "Maximum", "Basic" or "Minimum"

L3 Plug must match the classification of the L1 plug within +/- 1/2 turns

6-Step Crest Check Plug: When the L1 plug is at the maximum notch, the 6-step gage must go between "MX" and "MXT" notch. When the L1 plug is at the Basic Notch, the 6-Step Gage must go between "B" and "BT" notch. When the L1 plug is at minimum notch, the 6-Step Gage must go between the "MN" and "MNT" notches.

Click here to view more information about our NPT Thread Gage

Click here to learn more about the basic use of NPTF 3-step & 6-step gages

Click here to view more information about our NPTF Thread Gage

Click here to view more information about NPTF Class 2 Specifications

Click here to view more information about ANSI Thread Series Designations