The JBO Thread Plug Gauge (GO) is a precision go/no-go tool for inspecting internal threads in holes. Designed for metric fine threads, it verifies M42 x 1 left-hand threads to ensure holes meet the 6H tolerance, supporting quick, accurate quality checks across manufacturing, assembly, and maintenance environments.

• Accurate GO verification for M42 x 1 metric fine left-hand threads: Fast go/no-go checks that confirm holes meet the 6H tolerance, reducing guesswork and rework in quality control.
• Hardened steel construction for durable, long-lasting use: Resists wear in busy workshops and maintains precision over many inspections and cycles.
• Ergonomic knurled design for easy handling: Secure grip and quick orientation in tight spaces or with gloves, speeding up checks and improving consistency.

By using this gauge, you gain faster, more reliable hole inspections, smoother QC workflows, and confidence that your M42 x 1 left-hand threaded holes meet specification every time. Its durable build and user-friendly design integrate seamlessly into existing inspection routines, helping teams reduce downtime, improve part consistency, and maintain high standards across production and maintenance tasks.