The JBO Thread Plug Gauge is a purpose-built inspection tool for metric fine threads, enabling fast, confident checks of internal threads in holes and housings. Designed for machinists, quality inspectors, and assembly technicians, it helps you verify thread suitability before assembly.

Designed for M20 x 1 threads with a right-hand orientation and 6G tolerance, this gauge provides precise go/no-go checks that confirm correct thread engagement and seating without guesswork. Its compact form and robust construction make it a reliable staple in both workshop and production environments.

• Go/No-Go quick checks: Inspect threaded holes in seconds with a simple pass or gentle resistance check, delivering clear accept/reject results to speed setup and quality control.
• Metric fine thread compatibility: Specifically matched to M20 x 1 metric fine threads with 6G tolerance and right-hand orientation, ensuring consistent, standard-compliant measurements across parts.
• Hardened steel durability: Built from hardened steel for long life, exceptional wear resistance, and reliable performance under daily shop use.

With the JBO Thread Plug Gauge, you standardize thread verification, reduce rework, and speed up assembly. Rely on precise, consistent results that help you hit tight tolerances and maintain productive workflows across engineering, manufacturing, and maintenance tasks.