The JBO Thread Ring Gauge (GO) for UNC threads is a precision go gauge designed to verify external thread diameters with speed and confidence. It targets 5/8 x 11 left-hand UNC threads and uses a 2A tolerance to help you quickly confirm parts meet specification.

Crafted from hardened steel, this ring gauge delivers durability in demanding environments while preserving accurate measurements for repeatable quality checks over time.

• Clear pass/fail indication: Quickly determine whether a part's thread diameter conforms to UNC 5/8 x 11 left-hand 2A specifications, reducing inspection time and guesswork.
• Rugged, wear-resistant construction: Hardened steel design withstands frequent use in busy shops and maintains accuracy after repeated measurements.
• Precise UNC left-hand tolerance (2A): Engineered specifically for 5/8 x 11 left-hand threads to deliver reliable, repeatable checks and fewer reworks.

Using this gauge in QC routines, you streamline inspections, lock in consistent results, and minimize rework by catching non-conforming parts early. Its straightforward go gauge action helps teams document conformance, train new staff, and keep production moving with confidence.