The JBO Thread Ring Gauge (NoGo) – Metric Coarse, Right Hand, 6e, M39 x 4 – is a precision inspection tool designed to verify external thread diameters to exacting standards. It’s ideal for quality control teams, machinists, inspectors, and maintenance crews who need fast, reliable checks on metric coarse threads on a range of components.

Crafted from hardened steel, this NoGo gauge offers outstanding durability and wear resistance to hold its accuracy through tough daily use. Its simple pass/fail design makes it easy to identify non-conforming parts, keeping workflows moving and reducing rework in busy shops or production lines.

• NoGo external thread check: Quickly confirms that external metric coarse threads meet the NoGo limit, enabling fast pass/fail decisions and reducing inspection time.
• Durable hardened steel construction: Built to resist wear and maintain accuracy in daily use, delivering long service life in demanding environments.
• Clear, user-friendly inspection: Designed for straightforward use on the shop floor, providing reliable readability to help identify non-conforming components and keep QC consistent.

Together, these features help you streamline quality control, ensure consistent thread fits, and maintain reliable production performance. The JBO Thread Ring Gauge supports precise, repeatable checks that reduce downtime and support compliant, high-quality assemblies across your manufacturing or maintenance workflows.