Crest Check Plug Gage Instrument Information
A precisely machined metallic gage used for checking the crest dimensions of threaded machined parts. The gage is machined smooth and checks the limits and taper of the minor diameter of a threaded hole.

Common Uses
Measuring the minor diameter of a threaded hole, such as in a nut, female pipe or other machined hole.
Common Types
- Number of Steps (3, 6)
- Thread Type (NPTF, ANPT, BSPT)
- Class (XX, X, Y, Z, ZZ)
Measurement Parameter
- Inside Diameter
- Threading
Gage Type
Attribute
Calibration Discipline
Calibration Equipment Used
Universal Linear Measuring (ULM) System