The JBO Thread Plug Gauge (NoGo) - Metric Fine is a precision inspection tool designed to verify metric fine-threaded holes with confidence. Aimed at engineers, machinists, quality inspectors, and shop crews, this NoGo gauge helps you quickly confirm whether a hole meets the required metric fine specification for reliability and proper assembly. It’s specifically sized for M55 x 4, right-hand threads, with 6H tolerance to ensure accurate gauging across your production line.

• Precise NoGo verification for metric fine threads: Delivers clear pass/fail indications for hole readiness, helping you speed up inspections and reduce rework by catching nonconforming parts early.
• Durable hardened steel with knurled grip: Built to endure daily use in busy work environments, resist wear, and provide a secure, non-slip grip for repeatable measurements even in tight spaces.
• Optimized for M55 x 4, 6H right-hand threads: Specifically matched to standard metric fine-hole sizes, ensuring reliable measurements and consistent results in quality control and assembly processes.

Using the JBO NoGo Metric Fine plug gauge streamlines your thread inspection workflow. Its robust construction and precise dimensions support repeatable gauging, helping you maintain tighter quality control, reduce downtime, and confidently verify threaded components before they move to the next production step.