The JBO Thread Plug Gauge (GO) — Metric Fine, Right Hand, 6H, M125 x 3 — is a precision inspection tool designed to quickly verify threaded holes meet exact specifications. Ideal for engineering shops, manufacturing lines, service centers, and hobbyists, this GO gauge helps you confirm that internal threads are correctly formed and ready for mating fasteners, speeding up quality checks without guesswork.

Crafted from hardened steel, the gauge delivers excellent wear resistance and long-lasting accuracy in demanding work environments. Its robust construction stands up to daily use in busy production areas, helping maintain calibration over time. The user-friendly design makes it easy to identify whether a hole is properly threaded, supporting consistent, reliable inspection results across batches.

• Precise metric fine GO size (M125 x 3): Confirms holes are machined to the exact M125 x 3 thread with 6H tolerance, enabling fast, confident acceptance tests of threaded holes.
• Hardened steel for long wear: Built to endure daily use in busy shops, resisting wear so calibration stays accurate over many inspections.
• Right-hand orientation for common threads: Designed specifically for right-hand metric fine threads, ensuring reliable readings and reducing misreads during setup and inspection.

Using this GO gauge simplifies thread inspection by providing a straightforward pass/fail reference: a smooth seating indicates the hole meets the specification, while resistance signals an out-of-tolerance condition. This clarity helps reduce rework, speeds up production, and supports consistent, high-quality assembly across all parts and runs.