The JBO NoGo Thread Ring Gauge is a precision tool for quickly verifying external thread diameters on fasteners and components. It is tailored for metric fine threads, such as M17 x 1, and is ideal for engineers, machinists, inspectors, and quality teams who need reliable go/no-go checks in busy shops.

Built for reliability, this right-hand gauge (6h) uses hardened steel and tight manufacturing tolerances to resist wear and maintain accuracy over time, even in demanding environments.

• Accurate NoGo checks for metric fine threads: Quickly identify undersized or oversized threads on M17 x 1 and other fine-thread components, enabling fast, confident pass/fail decisions and reduced rework.
• Durable hardened steel construction: Built to withstand daily shop wear, delivering long service life and stable calibration in challenging environments with minimal maintenance.
• Right-hand orientation, 6h tolerance: Designed to align with standard metric thread practices, delivering consistent results across common fasteners and reducing measurement drift over time.

The JBO NoGo Thread Ring Gauge helps you streamline quality control, minimize downtime, and ensure threaded parts meet exact specifications. Its robust, easy-to-use design supports quick inspections, clear identification of non-conforming parts, and reliable performance in production, assembly, and maintenance workflows.