The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It's ideal for engineers, machinists, and quality teams who need fast, reliable checks of threaded holes.

Specifically built for left-hand M14 x 1.25 threads with a 6H tolerance, this Go/No-Go gauge helps verify that holes will accept mating parts, reducing guesswork and rework in assembly and maintenance tasks. The hardened steel construction delivers consistent performance in workshop conditions.

• Go/No-Go speed for confident checks: Quickly determine whether a threaded hole passes or fails tolerance, cutting inspection time and preventing incorrect assemblies.
• Hardened steel durability: Built to resist wear and deformation, providing long-lasting accuracy through heavy use in demanding shop environments.
• Precise metric fine-thread compatibility: Calibrated for M14 x 1.25 with 6H tolerance, delivering reliable, repeatable measurements that support quality control and fit verification.

This gauge helps streamline workflows by delivering clear, consistent results you can trust. Use it in production QA, routine maintenance, or repair work to speed up checks, reduce downtime, and improve overall part fit and performance.