The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It helps engineers, machinists, quality teams, and hobbyists quickly verify that threaded holes meet exact specs so components thread in smoothly.

Featuring a Go/No-Go design, it enables fast, unambiguous checks—you can confirm both the minimum and maximum acceptable engagement in seconds. Built with hardened steel, this gauge delivers long-lasting wear resistance for repeated use in busy workshops.

• Fast, reliable Go/No-Go checks: Quickly determine whether a threaded hole accepts the plug to spec, reducing inspection time and rework.
• Hardened steel construction: Withstand daily use and maintain accuracy even after countless insertions and removals.
• Left-hand metric fine thread compatibility (M7 x 0.75, 6G): Precisely matches left-hand M7 x 0.75 threads, ensuring correct fit and preventing cross-threading in specialized applications.

This plug gauge helps you streamline quality control, shorten setup time, and reduce costly fitting errors. By providing clear pass/fail results, it supports consistent thread engagement across assemblies and improves overall workflow in manufacturing or repair environments.