The JBO Thread Ring Gauge (GO) - UNF - Right Hand - 2A - 1 3/8 x 12 is a precision Go gauge designed for fast, reliable verification of external UNF threads. It's ideal for machinists, inspectors, engineers, and quality teams who need quick, confident checks during manufacturing, assembly, and repair.

Constructed from hardened steel, this gauge resists wear and maintains accuracy in busy workshops. The 1 3/8 x 12 size with 2A tolerance and right-hand orientation aligns with standard UNF threads, delivering consistent results across parts and suppliers.

• Accurate UNF GO verification: Quickly determine if an external UNF thread conforms to the Go limit, enabling fast pass/fail decisions and streamlined quality checks.
• Durable hardened steel construction: Built to resist wear, maintain dimensional stability, and provide long service life in demanding workshop environments.
• Size and tolerance matched to UNF standards: Right-hand 2A class, 1 3/8 x 12 size ensures reliable compatibility with common UNF components and consistent results across batches.

The JBO GO thread ring gauge helps you speed up inspection, improve first-pass acceptance, and reduce downtime. By delivering clear, reliable pass/fail feedback, it supports precise assembly, better supplier qualification, and traceable quality records—all while standing up to daily use in metalworking, manufacturing, and repair environments.