Brand new NPT 1/16" 1/8" 1/4" 3/8" 1/2" 3/4" 1" ~ 2" Taper Pipe Plug Thread Gage Gauge

This plug gauge is a standard tool for testing NPT threads.

The plug gauge has 3 step marks

Rotate this plug gauge into the inspected thread.

when Thread to “下” this thread Size Small Unqualified threads

when Thread to “基” this thread Size Standard Qualified threads

when Thread to “上” this thread Size Large Unqualified threads