The JBO Thread Plug Gauge (GO) — Metric Fine — Right Hand — 6H — M55 x 1 is a precision tool for verifying threaded holes. It’s ideal for engineers, machinists, quality inspectors, and shop-floor technicians who need quick, reliable go/no-go checks on metric threads.

Crafted from hardened steel, this plug gauge resists wear and stays accurate through repeated use. Its knurled, compact body is easy to grip and maneuver, even in tight spaces, and the GO designation provides a clear indication of a properly threaded bore at a glance.

• Precise GO indication for M55 x 1 threads: Quickly confirms a hole is correctly threaded to the metric fine size within the 6H tolerance, enabling fast pass/fail decisions.
• Durable hardened steel construction: Built to resist wear and maintain accuracy in demanding shop environments, delivering long service life between replacements.
• Ergonomic, right-hand design with knurled grip: Easy insertion and handling, even with gloves, supporting repeatable checks and reduced operator fatigue.

Using the JBO Thread Plug Gauge helps you streamline quality control by delivering fast, confident measurements that reduce rework and downtime. With reliable, durable performance, you can standardize hole inspection across batches, improve workflow, and ensure your threaded assemblies meet specification with every check.