The JBO Thread Ring Gauge (NoGo) is a precision tool for verifying external UNF threads to exacting standards. Designed for right-hand threads in the 1/4 x 28 size with a 3A class, it helps technicians, inspectors, and machinists quickly confirm that components meet the Unified Thread Standard before assembly or repair.

• Go/No-Go Quick-Check for UNF Threads: Quickly determine whether a part’s external thread matches the 1/4 x 28 UNF size and 3A class, enabling fast pass/fail decisions during setup, inspection, and quality control.
• Rugged Hardened Steel Construction: Built to withstand daily shop use with excellent wear resistance, maintaining accurate dimensions and reliable performance over thousands of measurements.
• UNF 1/4-28 Right-Hand, 3A Standard: Conforms to a widely used thread specification, ensuring compatibility across components and reducing rework from misfits.

With the JBO Thread Ring Gauge NoGo, you gain a reliable, fast way to validate external threads during incoming inspection, assembly, or maintenance. The clear pass/fail capability helps reduce downtime, improves workflow accuracy, and supports consistent thread quality across your manufacturing or service operations, ensuring proper fit and dependable performance in finished parts.