The JBO Thread Plug Gauge (NoGo) – Metric Fine is a precision measuring tool designed to verify threaded holes with metric fine threads. Specifically tailored for 4H class M56 x 2 threads, it provides a fast, reliable check that helps ensure holes meet the maximum size specification for precise mating parts. This NoGo gauge is ideal for inspectors, machinists, and production teams who value consistent quality and quick pass/fail decisions on threaded components.

Manufactured from hardened steel for exceptional wear resistance, this gauge holds its accuracy through repeated use in demanding workshop environments. Its knurled, ergonomic body offers a secure grip and easy one-handed handling, while the right-hand orientation speeds alignment during inspection tasks—even when wearing gloves.

• Precise metric fine thread verification: Quickly confirms the NoGo maximum size for M56 x 2 holes, helping parts stay within tolerance and reducing rework.
• Durable hardened steel construction: Built to withstand daily use, resisting wear to maintain accurate readings over the long term.
• Ergonomic right-hand grip: Knurled handle enables fast, repeatable checks with one hand, enhancing productivity in tight spaces.

Used in quality control and production workflows, this gauge helps you make confident, time-saving decisions on threaded hole acceptance. By delivering reliable NoGo checks for M56 x 2 metric fine threads in 4H holes, it supports consistent results, reduces inspection time, and helps maintain smooth downstream assembly.