The JBO Thread Ring Gauge (GO) – Metric Fine is a precise go gauge designed to verify external thread diameters on fasteners, fittings, and machined parts. It’s ideal for inspectors, machinists, engineers, and quality teams who need quick, reliable confirmation that threaded components meet exact standards.

Made from hardened steel for durability, this right-hand ring gauge covers the metric fine thread specification M40 x 1.5 with a 6g class. The GO design makes it straightforward to identify properly conforming threads during quality control and incoming inspections.

• Precise GO gauge for metric fine threads: Ensures accurate checks of external thread diameters to confirm components meet the M40 x 1.5, 6g specification, helping you prevent mismatches before assembly.
• Durable hardened steel construction: Withstands daily workshop use, resisting wear and maintaining accuracy over many inspections in demanding environments.
• User-friendly inspection tool: Quick go/no-go results that speed up QA and reduce downtime, providing clear guidance for accepting or rejecting parts.

This gauge helps you streamline your quality workflow by enabling fast, confident identification of compliant threads, reducing rework and batch failures. Its rugged build ensures long service life in busy shops, while the metric fine specification aligns with standard fasteners for reliable, repeatable results across projects.