The JBO Thread Ring Gauge (GO) for UNC right-hand threads is a precision inspection tool designed to confirm external thread diameters align with the UNC 1/4 x 20 standard. Built for machinists, inspectors, and quality teams, it provides a fast, reliable pass/fail check that keeps assemblies moving and reduces guesswork in threaded component verification.

Whether you’re setting up a new production line or performing routine quality checks, this GO gauge helps you verify components quickly and consistently, supporting accurate documentation and traceability in your quality system.

• Go/No-Go verification for UNC 1/4 x 20: Quickly determine whether a threaded component meets the GO limit, enabling fast clearance decisions and reducing inspection time.
• Hardened steel construction for durability: Engineered to resist wear in busy workshops, maintaining accurate dimensions over thousands of cycles and demanding use.
• 3A-class, Right-Hand UNC compatibility: Precisely sized for common right-hand UNC threads with 3A tolerance, delivering consistent checks across standard fasteners.

Using the JBO GO gauge helps improve workflow by delivering clear go/no-go results, supporting quality control records, and helping you prevent misfits before assembly. Its robust design and reliable performance contribute to longer tool life and fewer reworks, so you can trust each measurement as part of your precision process.