Thread plug gages are fascinating products when you consider the technical details that go into their manufacture and the precision they embody. To some, they look like fancy bolts and are treated accordingly. 

Screw threads are one of those important elements of mechanical design that are often taken for granted but find usage in critically important applications.

External thread inspection can seem confusing and, in some cases, frustrating. There is a wide variety of inspection tools available for external threads.

Working thread plug gages are the fixed limit functional gages used to inspect product threads on a pass/fail basis.