JBO Thread Plug Gauge – Metric Fine Go/No-Go, Left Hand, 6G, M12 x 1.25 is a precision inspection tool designed for metric fine threaded holes. Whether you’re in a machine shop, assembly line, or maintenance department, this gauge helps you verify fit quickly and with confidence.

Built for reliability, it uses hardened steel to withstand daily use, delivering repeatable measurements that support tight quality control and consistent results across parts that require M12 x 1.25 left-hand threads.

• Go/No-Go quick checks for metric fine threads: Quickly determine if a threaded hole is within tolerance by testing with both ends, reducing inspection time and guesswork.
• Durable hardened steel construction: Designed for longevity in demanding workshop environments, resisting wear and maintaining accuracy over thousands of inspections.
• Precise metric fine-thread compatibility: M12 x 1.25, Left-Hand, 6G: Specifically tuned for metric fine-thread holes, delivering reliable acceptance tests and reducing the risk of mismatched components in critical assemblies.

With this gauge, you gain a dependable, repeatable method to verify thread engagement before assembly. Its robust construction stands up to shop conditions, while the precise Go/No-Go checks help you cut setup times, reduce downtime, and improve overall quality of threaded joints. Use it across manufacturing, repair, or maintenance tasks to ensure every M12 x 1.25 left-hand threaded hole meets spec, every time.