ring gage

noun

1. a gage for checking the diameters of circular manufactured objects, consisting of a ring having a hole that is of either the maximum or minimum allowable diameter.

Example Sentences

These clearances are measured by what are called clearance gages, which are simply taper slips of steel about 1/2-inch wide accurately ground and graduated, like a jeweler's ring gage, by marks about 1/2-inch apart; the difference in thickness of the gage is one-thousandth of an inch from one mark to the next.

From Project Gutenberg