The JBO Thread Ring Gauge (GO) for UNF threads is a precision go gauge designed to verify external thread diameters with confidence. Specifically built for left-hand UNF threads in No. 6 x 40 size, it streamlines quality checks in machining, assembly, and maintenance environments.

Manufactured from hardened steel, this gauge stands up to daily use in busy workshops. Its straightforward design makes it easy to identify properly conformed threaded components, helping teams maintain consistent standards across production runs.

• Precise UNF GO verification: Delivers accurate pass/fail readings for external UNF threads, ensuring No. 6 x 40 left-hand threads meet specification quickly and consistently.
• Hardened steel construction: Engineered for longevity, resisting wear, corrosion, and maintaining dimensional stability over time in demanding environments.
• User-friendly inspection design: Clear geometry and smooth interface allow fast checks, reducing inspection time and minimizing misreads in QA.

With the JBO Thread Ring Gauge, inspectors gain quick, objective confirmation of left-hand UNF No. 6 x 40 threads, speeding setup, cutting rework, and ensuring compliant assemblies. The combination of durable hardened steel and precise GO geometry delivers repeatable measurements across shifts, giving your team confidence in every inspection and helping maintain high-quality standards in production and maintenance settings.