The JBO Thread Ring Gauge (NoGo) — Metric Fine is a precision inspection tool designed to verify external thread diameters. It serves engineers, inspectors, machinists, and maintenance teams across manufacturing, automotive, and industrial environments, helping you confirm that threaded parts meet the specified size.

Crafted from hardened steel, this gauge delivers durable wear resistance and long service life in demanding work environments. Its user-friendly design makes it easy to identify non-conforming threaded components at a glance, supporting efficient quality control and precise engineering.

• NoGo quick-check for non-conforming threads: The NoGo capability enables fast identification of out-of-spec threads, speeding up quality control and reducing rework by clearly signaling non-conforming parts.
• Hardened steel construction for durability: Built from hardened steel to resist wear, ensuring reliable performance and long-term accuracy in tough shop conditions.
• Metric fine compatibility with M21 x 0.75: Specifically matched to metric fine thread sizes, including M21 x 0.75, providing dependable, repeatable measurements for critical assemblies.

Using this gauge helps streamline inspection workflows, improve consistency across batches, and give technicians confidence that threaded components meet required standards, contributing to better quality, less downtime, and fewer returns.