The JBO Thread Ring Gauge (NoGo) is a precision tool for quickly verifying external UNC threads with accuracy. It’s designed for quality teams, machinists, and inspectors who need reliable checks of thread size and fit to keep assemblies safe and consistent.

It is specifically tailored for 1/2 x 13 Left-Hand UNC threads in the 2A class, ensuring measurements align with standard requirements. Built from hardened steel, the gauge resists wear on busy shop floors while preserving measurement integrity.

• NoGo design for quick conformance: NoGo-side checks provide immediate detection of oversize or out-of-tolerance threads, reducing inspection time and minimizing rework.
• Size-specific UNC Left-Hand 1/2 x 13, 2A: Precisely matched to this thread size and class to deliver consistent, repeatable readings across operators and parts.
• Durable hardened steel with knurled edge: Built for daily shop use with excellent wear resistance and a secure grip for easy handling and repeatable measurements.

With the JBO NoGo Thread Ring Gauge, your team gains a reliable, fast method to verify external threads, streamlining QA and assembly. It helps reduce downtime by catching mismatches early, improves fit consistency across production runs, and supports long-term quality standards in manufacturing, automotive, and aerospace applications. The rugged construction keeps readings stable over time, delivering dependable performance in demanding environments.