JBO Thread Ring Gauge (GO) - Metric Fine - Left Hand - 6g - M39 x 1.5 is a precision tool used to verify external thread diameters on fasteners, fittings, and machined components. It provides a quick, reliable go/no-go check to confirm threads meet exact standards during inspection and assembly.

Manufactured from hardened steel for exceptional wear resistance, this gauge is built to endure daily use in demanding workshops. Its left-hand configuration and 6g tolerance support accurate checks for left-hand threads, helping you maintain consistent quality and reduce rework.

• Precise metric fine-thread verification: The GO gauge is calibrated for M39 x 1.5, enabling fast, unambiguous pass/fail checks on external threads during quality control and assembly.
• Durable hardened steel construction: Withstand daily handling, resist wear, and preserve tolerance over time for dependable long-term use.
• Left-hand compatibility with 6g tolerance: Specifically designed for left-handed threaded components and tight tolerances, ensuring reliable measurement across a range of applications.

Using the JBO Thread Ring Gauge (GO) delivers faster inspections, clearer decisions, and more consistent results across teams. It helps you identify nonconforming parts early, reduce downtime, and maintain accurate thread engagement in manufacturing, automotive, and precision machining projects.