JBO Thread Plug Gauge is a precision tool for verifying metric fine internal threads. This left-hand Go/No-Go gauge is sized for M16x1 holes with a 6H tolerance, enabling fast, reliable inspection of threaded cavities. It's ideal for engineers, machinists, quality teams, and assembly lines that require consistent fits without guesswork.

• Go/No-Go quick thread validation: Rapidly confirm that LH M16x1 internal threads meet tolerance in a single check, reducing inspection time and the chance of misfits during assembly.
• Rugged hardened steel construction: Built to withstand daily shop use, resisting wear and retaining accuracy through thousands of insertions and removals.
• Left-hand M16x1, 6H precise sizing: Specifically matched to the target left-hand thread and 6H tolerance, ensuring reliable measurements and minimizing rework from incorrect gauges.

Using the JBO Thread Plug Gauge helps you streamline quality control and assembly workflows. It provides fast, repeatable measurements that confirm hole readiness, reduces downtime from fit failures, and gives you confidence that components will thread together smoothly across production runs.