The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It’s ideal for machinists, assemblers, quality control teams, and workshop technicians who need fast, reliable hole-thread verification. With a Go/No-Go design, it quickly confirms whether a threaded hole matches the M15 x 1 left-hand fine thread, helping parts fit together with confidence.

The gauges are built for reliability in busy environments, featuring hardened steel construction that stands up to repeated use and resists wear over time.

• Go/No-Go design for metric fine threads: Quickly verify threaded holes meet the M15 x 1 left-hand fine thread standard, speeding up inspection and reducing assembly errors.
• Durable hardened steel construction: Built to withstand daily use in demanding workshops, delivering long-lasting accuracy and minimal wear.
• Left-hand, 6H tolerance for precise checks: Specifically matched to left-hand M15 x 1 threads, ensuring consistent, repeatable measurements across parts and batches.

Using this gauge helps you cut inspection time, minimize rework, and ensure reliable thread fits across your production and maintenance tasks. It provides a clear, repeatable reference that supports better quality control and smoother assembly workflows.