The JBO Thread Ring Gauge (GO) - Metric Coarse is a precision go gauge designed to verify external threads quickly and accurately. It is tailored for right-handed metric coarse threads like M42 x 4.5 and uses a 6H tolerance to deliver reliable, on-spec checks for fasteners, connectors, and fittings. Crafted from hardened steel, it stands up to daily shop use while maintaining consistent accuracy over time.

• Precise metric coarse GO verification: Quickly and accurately confirms external thread diameters for metric coarse threads (e.g., M42 x 4.5), helping you catch undersize or oversize parts before assembly.
• Durable hardened steel construction: Built to withstand daily shop use, resisting wear and maintaining accuracy for long service life.
• Right-hand, 6H tolerance for consistent fit: Sized to match industry-standard coarse threads with a right-hand orientation, delivering repeatable, trustworthy checks across parts and assemblies.

This gauge helps streamline your inspection workflow by providing fast, dependable confirmation of threaded components, reducing rework and the risk of misfits. By ensuring proper fit and function of metric coarse threaded connections, it supports reliable performance across manufacturing, maintenance, and field service applications.