The JBO Ring Gauge (NoGo) - Metric Coarse - Right Hand - 6g - M39 x 4 is a precision inspection tool designed to verify external thread diameters for metric coarse threads. It is ideal for quality control teams, engineers, machinists, workshops, and maintenance staff who need quick, reliable pass/fail checks to ensure components meet specifications and fit correctly.

• Go/No-Go quick checks for metric coarse threads: Quickly determine whether an external thread meets the M39 x 4 6g tolerance, reducing inspection time and helping prevent mismatched parts from progressing through production.
• Durable hardened steel construction: Built to withstand daily use in busy environments, offering long wear resistance and maintaining accuracy through thousands of inspections.
• Right-hand, coarse-thread design tailored for M39 x 4 (6g): Specifically matched to your thread size and direction, delivering dependable and repeatable results for critical assemblies.

Using the JBO Ring Gauge (NoGo) streamlines your quality checks, delivering clear pass/fail decisions that support faster workflows, fewer reworks, and better traceability in your documentation. Its rugged construction and precise sizing help you maintain consistent results across shifts, making it a reliable addition to any quality control, engineering, or maintenance toolkit.