The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It’s ideal for machinists, quality inspectors, and assembly teams that require consistent hole sizes and accurate thread engagement. Built to streamline go/no-go checks, it helps you confirm fit quickly without guesswork.

With a Go/No-Go design, you can perform fast pass/fail assessments of threaded holes, speeding up setup and reducing inspection time. The hardened steel body resists wear in busy workshops, helping maintain accuracy and reliability over thousands of uses.

• Go/No-Go Design for Fast, Confident Hole Checks: Instantly verify whether the threaded hole accepts the gauge within tolerance, enabling quick pass/fail decisions and reducing rework.
• Durable Hardened Steel Construction: Built to withstand daily workshop use, resisting wear and maintaining accuracy for long service life.
• Metric Fine Thread Compatibility: M21 x 1.5, Right-Hand, 6H: Precisely matched to metric fine-thread applications, ensuring reliable checks aligned with standard threads and 6H tolerance.

The JBO Thread Plug Gauge helps you streamline quality control, reduce inspection time, and maintain consistent thread engagement across components. By confirming hole size and thread engagement quickly, it minimizes downtime and supports reliable, repeatable results in every project.