The JBO Thread Plug Gauge is a precision Go/No-Go inspection tool designed for metric fine threads. It helps engineers, machinists, quality inspectors, and maintenance professionals quickly verify threaded holes for proper engagement, enabling faster setup and more reliable assemblies.

Built for durability in busy shops, this gauge uses hardened steel to withstand regular use and maintain accurate measurements over time. Its right-hand design and exact M12 x 0.75 specification with a 6H tolerance ensure compatibility with common components and consistent results across production runs.

• Go/No-Go quick-check design: Instantly verify if a threaded bore meets tolerance in a single pass, cutting inspection time and eliminating guesswork during assembly.
• Rugged hardened steel construction: Ready for daily use in calibration and quality checks, resisting wear and delivering dependable performance mile after mile.
• Metric fine-thread precision (M12 x 0.75, 6H, Right-Hand): Specifically engineered for metric fine threads to provide reliable, repeatable gauging results for critical parts and assemblies.

This gauge helps you streamline quality control, reduce rework, and accelerate workflows by delivering confident pass/fail results on threaded holes. With its durable build and precise metric threading, you can trust it to deliver consistent performance in manufacturing, machining, and maintenance tasks—supporting accurate fits and documented reliability across your projects.