JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Sized for M20 x 1 right-hand threads with a 4H tolerance, its Go/No-Go design lets you verify threaded holes quickly and accurately, ensuring parts fit as intended.

Designed for engineers, machinists, inspectors, and shop technicians, this gauge speeds up setup and quality checks without guesswork. The compact, durable construction fits easily into busy work environments while delivering consistent measurements over time.

• Go/No-Go accuracy for fast verification: Instantly confirm whether a hole accepts the gauge or is out of tolerance, reducing inspection time and preventing misfits.
• Precise metric fine-thread size (M20 x 1) for right-hand threads: Ensures reliable checks for mating parts and consistent engagement in standard assemblies.
• Hardened steel construction for long life: Built to resist wear, maintaining accurate measurements through heavy use on the shop floor.

Using this gauge helps streamline assembly and QC workflows, reduce rework, and deliver reliable, repeatable results across production runs. Its straightforward Go/No-Go checks support quicker tool setup and heighten confidence that threaded components will mate smoothly.