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Grainger carries go/no go plug gauges to help you measure hole sizes in machining operations. Use Type A natural set plug gauge assemblies to verify and set adjustable threaded ring gages. Use Type B chrome plated plug gage assemblies to inspect internally threaded parts and to verify minimum and maximum pitch diameter limits. Choose from a large selection of plug gages that can help you accurately measure UNC, UNF, UNS and UNEF thread types in a wide range of thread sizes. Find high quality plug gauges at Grainger.