The JBO Thread Ring Gauge GO for Metric Coarse threads is a precision go gauge designed to verify external M39 x 4 threads with a right-hand orientation and 6e class. It’s built for professionals across manufacturing, engineering, maintenance, and quality control, delivering fast, dependable pass/fail checks that help ensure proper mating and reliable performance.

• Precise GO gauge for M39 x 4 metric coarse threads: Quickly confirm external thread conformance to the M39 x 4 standard, reducing inspection time and rework.
• Hardened steel construction for durability: Withstands daily shop use, resists wear, and maintains dimensional stability for long-lasting, repeatable measurements.
• Ergonomic, user-friendly design for fast checks: Smooth handling and straightforward insertion enable quick, confident readings and minimal downtime.

By providing fast, dependable verification of thread fit and tolerance, this gauge helps streamline inspection workflows, minimize downtime, and deliver consistent, reliable results across metric coarse threaded connections.