The JBO Thread Plug Gauge is a precision tool designed to verify metric coarse internal threads. This Go/No-Go gauge targets M18 x 2.5 threads, helping technicians and machinists confirm hole readiness with a simple pass/fail check. The left-hand variant, with 6H tolerance, provides a reliable reference for correct thread engagement and component fit.

• Go/No-Go design for fast verification: quickly determine whether a threaded hole falls inside the required limits, reducing inspection time and rework.
• Durable hardened steel construction: built to withstand daily workshop use, resisting wear and maintaining accuracy over many cycles.
• Specifically tuned for metric coarse threads (M18 x 2.5, 6H): ensures consistent, repeatable checks that align with common engineering and manufacturing standards.

Using this plug gauge streamlines quality checks by delivering clear pass/fail results for each hole. It helps protect critical fits, minimize downtime, and support reliable assembly across production, maintenance, and repair tasks.