ring gage

American  

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.

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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