The JBO Thread Plug Gauge (GO) – Metric Fine, Right Hand, 6H, M120 x 4 is a precision tool for inspecting threaded holes. Designed for inspectors, machinists, and quality teams, it quickly confirms whether a hole will accept the full threaded plug, helping ensure parts fit and function correctly.

Made from hardened steel, it stands up to daily use in manufacturing, automotive, aerospace, and maintenance environments. The compact, easy-to-read design provides reliable pass/fail feedback with minimal effort, supporting efficient quality control and consistent results across shifts.

• Accurate metric fine-thread GO gauge (M120 x 4): Quickly verify hole acceptance by testing the maximum permissible thread size, helping you catch undersize or damaged threads before assembly.
• Rugged hardened steel construction: Built to endure daily handling, resist wear, and maintain tolerance over time for long service life in demanding environments.
• Right-hand orientation for easy integration: Aligns with standard threaded-hole conventions and common inspection procedures, reducing setup time and the chance of misreads.

Using the JBO GO gauge streamlines your quality checks: you can confirm holes meet specification on the first pass, reduce rework, and keep production moving with confident pass/fail decisions. Its durability supports daily use in production lines, service shops, and lab environments, making it a reliable addition to any gauge kit for precision threading applications.