The JBO Thread Ring Gauge (GO) for UNC right-hand threads is a precision Go gauge used to verify external thread diameters on fasteners and threaded components. Designed for engineers, machinists, quality inspectors, and shop technicians, it provides quick, reliable confirmation that threads meet the required size and tolerance. This gauge is sized for UNC threads in the 2-1/2 x 4 range, ensuring compatibility with common fasteners.

Crafted from hardened steel, this ring gauge delivers exceptional wear resistance and long service life in demanding environments. Its straightforward, user-friendly design yields consistent go/no-go results with minimal setup—simply place the ring over the thread to verify a proper fit and speed up quality inspections.

• Durable hardened steel construction: Built to resist wear and maintain accurate measurements in busy workshops, factories, and field service.
• Fast, reliable Go/No-Go checks: Delivers clear pass/fail results for external UNC threads, reducing inspection time and rework.
• Standard UNC 2A right-hand sizing: Aligns with common fasteners and specifications for consistent, repeatable results across jobs.

This gauge helps streamline quality control workflows, shorten inspection cycles, and improve part-to-part consistency. With dependable performance and robust construction, it supports accurate threading verification across manufacturing, maintenance, and assembly environments.