The JBO Thread Plug Gauge (GO) – Metric Coarse is a precision inspection tool designed to verify metric coarse threads in holes and threaded components. It’s ideal for machinists, quality teams, and assembly professionals who need fast, reliable go-checks for M45 x 4.5 coarse threads, including left-hand configurations. Built from hardened steel, this gauge delivers durable, long-lasting performance in busy workshop environments.

• Left-hand GO gauge for quick orientation: Specifically designed for left-hand thread applications, enabling fast, accurate checks and reducing read errors on the production line.
• Precise M45 x 4.5 coarse thread with 6H tolerance: Calibrated to the exact external thread size and tolerance class, delivering consistent pass/fail results that support compliant quality control and reliable assembly.
• Hardened steel for enduring accuracy: Crafted from hardened steel to resist wear, maintain measurement stability over time, and withstand demanding use in tough environments.

Together, these features help you speed up inspections, cut rework, and ensure every threaded connection meets standard specifications. The durable, easy-to-use GO gauge supports repeatable results across high-volume runs, giving you confidence that components thread in smoothly and maintain their performance over the product lifecycle.