The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Specifically crafted for M9 x 1 holes with a right-hand orientation, it provides a fast, reliable Go/No-Go test to verify that threaded holes will accept mating components without under- or over-tolerance issues.

Built for demanding workshop use, this plug gauge features hardened steel for lasting wear resistance and dependable performance across many cycles. The Go/No-Go design lets technicians and inspectors quickly confirm hole readiness, reducing guesswork and rework in production and assembly settings.

• Go/No-Go Quick Checks: Quickly confirm hole suitability by testing both minimum and maximum material conditions, speeding setup and reducing misfits in production.
• Durable Hardened Steel Construction: Withstand frequent insertions and withdrawals, resist wear, and maintain accuracy over time in busy work environments.
• Precision Metric Fine Thread (M9 x 1, 4H, Right-Hand): Precisely sized for standard metric fine-thread holes, delivering consistent, repeatable checks that align with common fasteners and assemblies.

Using this gauge helps streamline quality checks, improve first-pass assembly, and protect tooling from unnecessary wear. The result is faster workflow, fewer rework cycles, and confidence that every M9 x 1 threaded hole will mate correctly with the corresponding fastener—every time.