The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. This left-hand gauge covers M30 x 2 with a 6H tolerance, making it ideal for assemblies where exact thread fit matters. It’s a practical choice for machine shops, quality labs, and maintenance teams that need reliable go/no-go hole checks in tight-tolerance work.

With its Go/No-Go design, you can quickly verify whether a threaded hole meets spec, reducing setup time and rework while keeping production moving smoothly. Built to endure daily use, it supports consistent, repeatable measurements across jobs.

• Go/No-Go quick verification: Instantly confirm whether the M30 x 2 thread hole conforms to spec, speeding setup and reducing guesswork in QA and assembly.
• Left-Hand metric fine-thread compatibility: Specifically designed for left-hand threads, ensuring you’re testing the correct configuration and avoiding misreads during inspection.
• Hardened steel construction for durability: Built from hardened steel to resist wear and maintain accuracy through frequent use and long service life.

The JBO Thread Plug Gauge helps you streamline thread inspections, minimize downtime, and improve assembly reliability. Its precise Go/No-Go checks give you confidence that holes accept fasteners as designed, while the rugged build stands up to busy workshop conditions. By delivering fast, repeatable results, this gauge supports efficient workflows, fewer returns, and higher-quality finished components for a wide range of metric fine-thread applications.