The JBO Thread Ring Gauge (GO) - Metric Fine, Right Hand, 6g - M140 x 3 is a precision inspection tool designed to verify external thread diameters quickly and reliably. Built for machinists, quality inspectors, and maintenance teams, it helps confirm that every threaded component meets the exact M140 x 3 metric fine standard and GO tolerance during in-process checks or final assembly.

Constructed from hardened steel for durability, it resists wear in busy workshops and long-term use. The ring’s clean, contact-friendly faces make it easy to insert test pieces and quickly identify components that conform to the standard, supporting reliable quality control in production lines and repair shops alike.

• Precise Metric Fine GO sizing (M140 x 3): Quick, reliable pass/fail verification of external threads to the exact M140 x 3 GO standard, reducing guesswork and rework on critical assemblies.
• Hardened steel construction: Delivers exceptional wear resistance and long tool life, even in high-volume manufacturing environments.
• Ergonomic knurled grip and intuitive handling: Easy to grip, align, and insert, helping inspectors perform fast, repeatable checks with minimal finger fatigue.

With the JBO GO thread ring gauge, inspectors and machinists gain confidence that every threaded connection meets spec, speeding setup, improving throughput, and ensuring consistent assembly quality across batches. Its durability and thoughtful design minimize downtime and maintenance, making it a dependable tool in any workshop or quality control program.