UNC Plug Gauges – Go/No-Go – Hardened Tool Steel High-precision Go/No-Go plug gauges for inspecting internal Unified Coarse (UNC) threads to ASME B1.1 standards. Designed for verifying thread conformity in machined components during manufacturing, assembly, or quality control. Made from hardened tool steel for reliability and long service life. Type: Unified Coarse Plug Gauge (Go/No-Go) Thread Standard: ASME B1.1 UNC Material: Hardened Tool Steel Available in a full range of UNC thread sizes Supplied with or without calibration certificate Need calibration? Click here to add a UKAS calibration certificate.