The JBO Thread Plug Gauge is a precision inspection tool designed to verify internal metric fine threads. Specifically built for M24 x 2 holes, this Go/No-Go gauge helps you confirm whether a thread meets the 6G tolerance while you assemble or inspect parts. The left-hand version is ideal for holes threaded in the opposite direction, ensuring accurate checks across a range of applications—from machine shops to field service.

Crafted with hardened steel and a knurled body for durability and grip, this gauge is engineered to withstand busy shop environments and deliver consistent, repeatable results over time.

• Go/No-Go verification for fast checks: Two calibrated ends allow quick assessment of minimum and maximum thread engagement, reducing setup time and guesswork.
• Rugged hardened steel construction: Built to endure daily shop use, resisting wear and maintaining accurate measurements across thousands of threads.
• Left-hand M24 x 2, 6G compatibility: Specifically matched to left-handed internal threads, ensuring reliable fits and consistent results in left-hand threaded assemblies.

Using this gauge helps you confirm thread acceptance quickly, streamline QC checks, and minimize misfits that cause rework or downtime. With a durable, easy-to-handle design, you’ll achieve consistent results across parts, improve first-pass assembly, and protect threaded components during routine maintenance and production runs.