The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads. It’s specifically configured for left-hand M38 x 1.5 threads (6H) and helps technicians, machinists, and inspectors verify internal threads quickly and confidently, ensuring parts fit together smoothly in production, assembly, or maintenance tasks.

• Go/No-Go quick checks in one tool: Quickly verify both the minimum (Go) and maximum (No-Go) limits for left-hand metric fine threads, reducing inspection time and preventing mismatches.
• Hardened steel construction: Built to withstand daily use in busy shop environments, delivering long-lasting wear resistance and stable measurements over thousands of checks.
• Ergonomic dual-ended design: Knurled, compact body provides secure handling in tight spaces, enabling consistent readings with less hand fatigue.

Using the JBO Thread Plug Gauge streamlines thread verification across manufacturing, assembly, and maintenance tasks. By confirming both Go and No-Go conditions for your left-hand M38 x 1.5 threads, it helps you avoid misfits, reduce rework, and keep production moving smoothly. The robust construction and comfortable grip support reliable, repeatable measurements in demanding environments, making it a dependable addition to any tool crib or workshop.