The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It’s ideal for engineers, machinists, quality control teams, and workshop technicians who require fast, reliable checks of hole threads. Specifically built for M18 x 1 right-hand threads in 6G tolerances, this Go/No-Go gauge helps confirm perfect fit before assembly.

Constructed for durability, the gauge uses hardened steel to withstand daily use while maintaining accuracy. The knurled body provides a secure grip, and the dual-end design allows you to perform go and no-go checks quickly in a single setup, keeping your workflow smooth and efficient.

• Dual-end Go/No-Go design: One end tests the minimum thread engagement (Go) and the other ensures the hole does not exceed the maximum limit (No-Go), delivering clear, repeatable pass/fail results in seconds.
• Hardened steel construction: Built to resist wear, corrosion, and impact in busy shop environments, preserving dimensional accuracy over thousands of inspections.
• Metric fine-thread compatibility: M18 x 1, right-hand, 6G: Precisely matched to common metric holes, reducing guesswork and ensuring consistent, reliable measurements across parts and batches.

Using this gauge streamlines your quality checks, speeds up assembly, and reduces rework by catching mismatches early. Its sturdy construction and clear go/no-go results help your team maintain tight tolerances with confidence, delivering consistent performance across every run and project.