Van Keuren Metric Thread Plug Gage Assembly GO/NOGO M14.0x1.50Van Keuren Metric Thread Plug Gages GO NOGO Van Keuren's Thread Gages allow you to inspect the pitch diameter and the functional thread for internal threaded products. All stock Metric Thread Plug Gages are made to Class X tolerances per ASME B1. 16M (Metric M Series Screw Threads). A Certificate of Accuracy is included with each gage. Available in 6H, and each Thread Plug Gage is marked with nominal size, threads per inch, class of fit and pitch