Metric Thread Ring Gauges

Metric thread ring gauges are precision inspection tools used to verify external metric threads on bolts, shafts, and machined components. They provide a fast pass/fail check against the specified standard, ensuring thread interchangeability without the time and variability of profile measurement.

This collection includes GO/NO-GO ring gauges for metric threads, available in a range of pitches and tolerance classes to match common production and metrology requirements. Options from Insize and Johs feature robust construction, high hardness for wear resistance, and dimensional stability for consistent repeatability, with clear markings for quick identification on the shop floor.

Thread ring gauges are widely used by CNC machining shops, QC/QA departments, fastener manufacturers, and industrial maintenance teams for in-process inspection, incoming quality control, and final verification prior to assembly.