The JBO Thread Ring Gauge (GO) for UNF threads is a precision inspection tool designed to quickly confirm external thread diameters meet exact UNF right-hand 3A 1 1/2 x 12 specifications. Built for engineers, machinists, quality teams, and maintenance crews, it streamlines threaded component checks across manufacturing, assembly, and service workflows.

Manufactured from hardened steel for outstanding durability, this GO gauge resists wear and maintains accurate dimensions even in busy workshop environments. Its straightforward design and reliable performance make it easy to use on the shop floor, helping you verify conformity with confidence and keep production moving.

• Rapid UNF GO verification: Enables quick pass/fail checks against UNF right-hand 3A 1 1/2 x 12 specifications, reducing inspection time and keeping projects on schedule.
• Durable hardened steel construction: Resists wear and maintains precise dimensions through repeated use, delivering long tool life in demanding environments.
• Ergonomic, easy-use design: Knurled outer edge provides secure grip and repeatable alignment, ensuring consistent measurements every time.

Using the JBO GO gauge helps you accelerate quality control, minimize rework, and ensure threaded components meet exact standards. It supports reliable, repeatable inspections across production lines, maintenance tasks, and quality audits, enabling you to deliver accurate, compliant results with greater efficiency.