Super Tools Corporation offers Go Ring Gauges, No-go Ring Gauges, Master or Set Ring Gauges in various Thread Types. Ring Gauges are typically cylindrical and are fabricated from a stable material with a highly precise bore in their center which functions as the gauge for the outside diameter of the parts.
https://stcgeartools.com/ring-gauges.php
1. Tolerance + / -0.003mm actual size will be marked.
2. Material: EN-31 / Tungsten Carbide.
3. Hardness: 60+ / -2 HRC in EN-31
4. Thread Type: BSPT, NPFT, NPSM, NPT, NPTF, UNC, UNEF, UNF, UNS, and Whitworth.
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