The JBO Thread Ring Gauge (GO) – UNF is a precision go gauge designed to verify external threads on right‑hand UNF components. Sized for 1-3/8" diameter with 12 threads per inch and 3A tolerance, it’s built for machinists, inspectors, and quality teams who need fast, reliable pass/fail checks. Crafted from hardened steel with a knurled outer edge, this gauge is ready for everyday use in busy shops and field service environments.

• Go/No-Go verification for UNF 1-3/8 x 12: Quickly determine whether external threads conform to the exact UNF specification, speeding inspection cycles and reducing rework.
• Hardened steel construction: Durable, wear‑resistant body that maintains accuracy and extends service life in demanding manufacturing and maintenance settings.
• Ergonomic, knurled grip for fast use: Secure handling and easy orientation in tight spaces, enabling repeatable, efficient checks with minimal setup.

By providing clear pass/fail indications on a single, hardened metal ring, this GO gauge helps you streamline quality control, improve consistency across parts, and keep production moving with confidence.