The JBO Thread Plug Gauge is a metric fine-thread Go/No-Go inspection tool designed to verify threaded holes quickly and accurately. Engineered for M33 x 1 right-hand threads, this gauge helps quality teams, machinists, and assembly professionals confirm hole tolerances before parts move to the next stage.

Made from hardened steel, it stands up to daily shop use and resists wear, delivering reliable readings over many measurement cycles. The knurled body provides a secure grip and precise alignment in bores, making consistent checks straightforward even in tight spaces.

• Go/No-Go quick verification: Quickly confirm hole size by testing both the Go and No-Go limits, speeding up quality checks and reducing guesswork.
• Hardened steel for durability: Built to withstand frequent use in busy workshops, resisting wear to maintain accurate checks over time.
• Metric fine-thread compatibility (M33 x 1, right-hand): Specifically designed for fine-thread holes in metric systems, ensuring reliable, repeatable readings for mating components and 4H tolerance.

Using this gauge streamlines inspection, helps prevent misfits in assemblies, reduces rework, and supports consistent performance across production runs. Its rugged construction and targeted design give you confidence in every measurement, whether in a manufacturing line, workshop, or maintenance environment.