An annular test gauge made of high-quality hardened steel is called adjusting ring. The steel is ground very fine and lapped for this usage. The adjusting ring serves as a reference dimension for multiple bore gauges, like the three point inside micrometer or the inside measuring surface of calipers.
Mostly setting ring gauges are knurled on the outside so that they are well in hand when measuring or adjusting the bore gauges.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.