The JBO Thread Plug Gauge (NoGo) – Metric Fine is a precision inspection tool for metric fine threads. It’s designed for machinists, inspectors, and assembly technicians who need quick, reliable checks of threaded holes. With its exact M42 x 1.5, right-hand, 4H configuration, it helps confirm hole size and readiness for safe, consistent fastener engagement.

• Precise metric fine thread calibration: Specifically sized for M42 x 1.5, the NoGo plug gauge delivers consistent, go/no-go checks that quickly confirm hole readiness and prevent misfit.
• Durable, wear‑resistant construction: Made from hardened steel to withstand daily shop use, maintain calibration, and resist wear and corrosion over time.
• Easy to use with reliable inspections: Ergonomic knurling and a clear NoGo indication enable fast, repeatable checks, reducing inspection time and rework in busy environments.

When used in your QC or production workflow, the gauge speeds up inspections, reduces rework, and improves consistency across parts. Its durable construction supports heavy use in busy shops, while the standard right-hand 4H M42 x 1.5 thread specification ensures repeatable results, making it easier to uphold tight quality standards and deliver reliable threaded assemblies.