The JBO Thread Ring Gauge (NoGo) is a precision tool designed to verify external UNF threads with a right-hand orientation (2A) at the No. 6 x 40 size. It’s ideal for engineers, inspectors, machinists, and quality teams across manufacturing, automotive, and aerospace applications, helping ensure every threaded component meets the required standard.

Built for demanding shop environments, this No-Go gauge provides fast, reliable conformance checks so you can identify undersized or oversized threads at a glance and prevent mismatches in assemblies.

• No-Go Design for Quick Conformance: The dedicated No-Go feature delivers an immediate pass/fail check against the UNF 2A No. 6 x 40 specification, helping inspectors spot out-of-tolerance threads without guesswork.
• Hardened Steel Construction: Made from hardened steel for lasting wear resistance, it maintains dimensional accuracy through high-volume use and tough daily production workloads.
• Ergonomic Knurled Edge for Easy Handling: A knurled outer edge provides a secure grip and precise orientation, even in tight spaces or when gloves are worn.

Used as part of a robust quality workflow, the gauge helps you validate thread quality quickly, reduce inspection time, and prevent improper fits. It supports repeatable, reliable results in routine checks and new part onboarding, giving you confidence in every measurement and smoother downstream production.