The JBO Thread Plug Gauge is a precision Go/No-Go tool designed to quickly verify metric fine-thread holes before assembly. Crafted for reliability in demanding environments, this gauge helps ensure your components fit together smoothly.

Designed specifically for left-hand threads, it covers M18 x 1.5 with a 6H tolerance, making it ideal for manufacturing, repair, and QA workflows where thread accuracy matters.

• Go/No-Go Quick Verification: Quickly determine hole-thread tolerance by confirming both go and no-go limits in a single check, reducing inspection time and minimizing guesswork.
• Exact M18 x 1.5 Left-Hand Fine Thread Match: Engineered specifically for metric fine threads, ensuring accurate seat and reliable pass/fail results for left-handed applications with 6H tolerance.
• Durable Hardened Steel Construction: Built to withstand frequent use in shop and production settings, delivering long-lasting wear resistance and consistent performance over time.

Using the JBO Thread Plug Gauge in your inspection routine helps speed up quality checks, reduces the risk of mismatched assemblies, and promotes consistent, repeatable results across parts that use left-hand metric threads.