The JBO Thread Plug Gauge is a precision tool designed for metric fine threads, specifically engineered for M20 x 2 with a 6H internal thread tolerance. Built for a right-hand thread, it provides a fast Go/No-Go check to verify threaded holes, helping you confirm fit and function at a glance. Ideal for machinists, quality control professionals, and maintenance technicians, this gauge streamlines acceptance testing in workshops, production lines, and repair tasks.

• Go/No-Go quick checks for metric fine threads: Enables fast, pass/fail verification of internal M20 x 2 threads to the 6H class, reducing inspection time and eliminating guesswork.
• Hardened steel construction for lasting durability: Built to withstand daily use in busy environments, maintaining accuracy and resisting wear over the long term.
• Ergonomic grip and precise alignment: Textured knurled body and well-machined ends provide a secure grip and quick, repeatable alignment for reliable measurements—even with gloves.

Using the gauge helps you confirm hole readiness quickly, speed up assembly and inspection workflows, and deliver consistent thread quality across parts. It reduces rework, minimizes downtime, and gives you confidence that each component will thread smoothly and reliably in the final assembly.