The JBO Thread Plug Gauge is a precision Go/No-Go tool designed specifically for metric coarse threads. It’s ideal for engineers, machinists, quality teams, and shop technicians who need fast, reliable verification that threaded holes meet spec for proper fit and function. This left-hand version is sized for M1.2 x 0.25 with a 5H tolerance, helping you confirm correct engagement in assemblies that use left-handed threads.

• Go/No-Go verification for metric coarse threads (M1.2 x 0.25): Quickly confirm hole dimensions meet spec by validating both the go and no-go limits, reducing guesswork and preventing misfits.
• Hardened steel construction for long-lasting accuracy: Built to endure daily use in busy shops, helping maintain consistent measurements and dependable performance over time.
• Ergonomic, knurled design for fast, secure checks: The textured grip enables precise handling and alignment, even with oily hands, speeding up inspections and improving repeatability.

This gauge combines a robust, durable build with a straightforward Go/No-Go approach tailored to metric coarse threads. It supports efficient quality control, accurate hole inspections, and reliable mating of components in manufacturing, maintenance, and assembly tasks.