The JBO Thread Plug Gauge is a left-hand, metric fine thread Go/No-Go gauge designed for precise inspection of threaded holes—specifically M12 x 0.5 with 6H tolerance. It helps engineering teams, machine shops, and maintenance crews quickly confirm that holes will accept mating parts without guesswork, boosting first-pass quality in every run.

• Go/No-Go quick checks: A simple pass/fail test for threaded holes lets you verify acceptance in seconds, speeding up batch inspections and minimizing handling time on the shop floor.
• Durable hardened steel construction: Built to withstand busy workshop environments, the hardened steel body resists wear and maintains accuracy through thousands of uses.
• Left-hand metric fine-thread compatibility (M12 x 0.5, 6H): Precisely tuned for left-hand components and fine-pitch threads, ensuring reliable checks across common industrial configurations.

In practice, this plug gauge helps you streamline quality control, reduce rework, and improve assembly accuracy. With a purpose-built Go/No-Go design and durable construction, it delivers consistent results and long service life in professional settings.