The JBO Thread Ring Gauge (NoGo) is a precision tool used to inspect external UNF threads. Specifically designed for right‑hand threads in the 1 3/8 x 12 size with a 3A class fit, it helps ensure components meet Unified thread standards across manufacturing, automotive, and aerospace applications.

This NoGo ring gauge makes it easy to verify that threads are within tolerance and quickly identify non‑conforming parts, reducing rework and inaccurate assemblies. Crafted from hardened steel, it delivers durable performance for daily use in busy inspection rooms and workshops.

• Go/NoGo validation for UNF external threads: Quickly determine if a thread meets the 1 3/8 x 12 UNF 3A specification, enabling fast, reliable pass/fail decisions during quality checks.
• Durable hardened steel construction: Built to withstand frequent handling and contact with threaded parts while maintaining consistent accuracy over time.
• Right‑Hand UNF 3A 1 3/8 x 12 design: Precisely matched to common industry standards, ensuring dependable inspections and minimizing ambiguity in fitment decisions.

Using this gauge streamlines quality control, speeds up inspections, and reinforces confidence that threaded components will assemble correctly in the final product.