The JBO Thread Ring Gauge (GO) - UNF - Right Hand - 2A - No. 3 x 56 is a precision GO gauge designed to verify external thread diameters against UNF standards. Built for engineers, inspectors, machinists, and quality teams, it speeds up the inspection process while delivering reliable results.

Constructed from hardened steel, it resists wear and maintains tight tolerances in demanding environments, ensuring long‑lasting performance on the shop floor. Its straightforward, user‑friendly geometry makes it easy to identify conforming threads at a glance, supporting consistent quality control across projects.

• Exact GO/UNF verification: Enables quick, reliable checks of external thread diameters to ensure parts meet UNF specifications during routine inspections.
• Hardened steel construction: Provides excellent wear resistance and durability, delivering long service life in busy workshops and production lines.
• User‑friendly conformance design: Lets operators rapidly distinguish compliant parts, reducing inspection time and helping maintain steady workflow and quality.

Using the JBO Ring Gauge keeps thread inspection precise and efficient, improving first‑pass yields and reducing rework. Its robust build and accurate geometry give you confidence in every measurement, helping you meet standards while maintaining productivity and quality across your operations.