The JBO Thread Ring Gauge (NoGo) is a precision tool designed to verify external metric threads quickly and reliably. Crafted for fine-thread work, it targets metric M8 x 0.5 right-hand threads in the 6h class, making it a trusted choice for machinists, quality inspectors, and production teams across manufacturing, automotive, and engineering environments.

Designed for use in busy shops and controlled QC environments, it helps you confirm part eligibility at a glance, reducing guesswork and rework.

• Durable hardened steel construction: Built to withstand daily use in busy workshops, with wear resistance that preserves accuracy and extends gauge life.
• Precise metric fine threading (M8 x 0.5, Right Hand, 6h): Ensures accurate external thread diameter checks that conform to standard metric specifications, enabling consistent part acceptance.
• NoGo quick-pass/fail inspection: The NoGo design makes out-of-spec threads instantly evident, speeding up quality control and reducing rework.

This gauge helps streamline threaded component inspection, enabling faster decision-making, fewer defects in assembly, and reliable performance across projects. By delivering consistent measurements and a durable build, it supports smooth workflows, improved throughput, and confident purchases for teams that depend on precise threading standards.