The JBO Thread Plug Gauge (NoGo) — Metric Fine, Right Hand, 6H, M42 x 1.5 — is a precision tool designed for confirming the size and condition of metric fine threaded holes. It’s ideal for engineers, machinists, inspectors, and workshop teams that need quick, reliable NoGo checks to ensure holes meet specification.
Crafted from hardened steel for durability, this gauge resists wear and maintains accuracy through heavy use in demanding environments.

• Exact NoGo verification for M42 x 1.5 threads: Quickly confirms whether a threaded hole is within tolerance by ensuring the NoGo plug cannot over-insert, reducing guesswork and rework.
• Rugged hardened steel with knurled grip: Built to endure daily shop floor use and provides a secure, comfortable grip even with oily or gloved hands.
• Right-hand metric fine thread, 6H tolerance: Ensures compatibility with standard metric fasteners and mating components, delivering consistent, repeatable measurements across jobs.

This gauge helps you speed up quality checks, improve measurement reliability, and maintain consistent thread tolerances across production runs. With durable materials and a thoughtful design, it delivers dependable performance in demanding environments, giving you confidence in your assemblies and inspections.