The JBO Thread Ring Gauge (NoGo) is a precision tool for verifying external UNC threads on fasteners, fittings, and machined components. This gauge is specifically sized for Left-Hand UNC threads in the 9/16 x 12 family and is aligned with the 2A tolerance class to support reliable inspection in quality control workflows across manufacturing, automotive, and aerospace applications.

Crafted from hardened steel, the gauge stands up to daily use on the shop floor, delivering durable performance and consistent measurements over time.

• NoGo design for rapid conformance checks: The no-go face makes non-conforming threads instantly obvious, helping you catch undersized or out-of-tolerance threads without guesswork, saving inspection time and preventing misfits in assembly.
• Left-Hand UNC 9/16 x 12, 2A class compatibility: Specifically matched to standard external threads used in automotive and aerospace components, enabling reliable cross-checks and consistent results across parts governed by the 2A tolerance.
• Durable hardened steel for everyday reliability: Built to withstand frequent handling on busy production floors, preserving accuracy and reducing the need for frequent recalibration.

With the JBO Thread Ring Gauge (NoGo), you streamline quality checks, reduce rework, and ensure external threads meet exact UNC standards before they ship. Designed for inspectors, machinists, and quality teams, it delivers dependable fit and function across parts and assemblies, improving workflow efficiency and confidence in every measurement.