The JBO Thread Ring Gauge (NoGo) for UNC external threads is a precision inspection tool designed for manufacturers, machinists, QA teams, and assembly specialists. Sized for 1/4 x 20 with a left-hand thread and a class 2A tolerance, this gauge helps confirm that threaded components meet Unified thread standards at a glance.

With a robust hardened steel construction and a dedicated NoGo feature, this gauge makes it easy to spot non-conforming threads and prevent misfits from advancing in your workflow. It’s well-suited for automotive, aerospace, and general manufacturing environments where precise thread verification matters.

• NoGo verification for immediate non-conformance checks: The NoGo face makes it simple to identify out-of-tolerance threads at a glance, speeding up quality checks and preventing faulty parts from moving down the line.
• Hardened steel construction: Built to resist wear and maintain accurate measurements through thousands of cycles in busy workshop environments.
• UNC Left-Hand, 1/4 x 20, 2A class compatibility: Specifically sized for common left-hand UNC threads and production tolerances, ensuring consistent, standard-compliant readings across parts.

This gauge helps streamline inspection workflows, improve first-pass yields, and provide reliable, repeatable measurements for threaded components. With its durable build and clear NoGo indication, you can trust your thread quality decisions and keep assemblies performing as designed.