The JBO Thread Ring Gauge (GO) - UNJF - Right Hand - 3A - No. 12 x 28 is a precision GO gauge designed to verify external thread diameters and ensure components meet the UNJF right-hand thread standard. It enables quick, reliable pass/fail checks that support consistent quality across manufacturing, maintenance, and repair tasks.

• Accurate GO size for UNJF right-hand threads: Provides a precise go/ no‑go measurement that confirms external threads conform to UNJF, Right Hand, 3A class (No. 12 x 28), helping you catch out-of-tolerance parts at the inspection stage.
• Hardened steel construction for long life: Built to withstand daily use, resisting wear and deformation so the gauge remains accurate through thousands of inspections in demanding shop environments.
• Easy, fast inspection with clear conformance: Intuitive go/no-go operation and a grip-friendly, knurled outer ring streamline setup and usage, delivering quick, confident conformance decisions for faster QA workflows.

Designed for a wide range of users—from engineers and inspectors to shop floor technicians and maintenance teams—the JBO Thread Ring Gauge offers dependable, repeatable results. Its robust construction and straightforward operation help reduce downtime, minimize rework, and support precise thread verification, so you can trust every part meets the required UNJF specifications.