The JBO Thread Plug Gauge is a precision instrument crafted for metric fine threads, offering fast, reliable inspection of internal holes. It’s a practical tool for engineers, machinists, inspectors, and maintenance teams who need to ensure components thread together with confidence.

This Right Hand gauge, sized M33 x 0.5 with 6H tolerance, uses a Go/No-Go design to quickly verify that threads meet spec and will assemble smoothly in production and service environments.

• Go/No-Go design for fast, confident checks: Quickly confirm whether internal threads are within tolerance, reducing inspection time and the risk of mismatches.
• Metric fine-thread accuracy: M33 x 0.5, Right Hand: Built to match standard metric fine-thread specifications, ensuring reliable, repeatable measurements in everyday manufacturing and maintenance tasks.
• Hardened steel construction for durability: Rugged material resists wear and preserves calibration through heavy use on the shop floor.

Using the JBO Thread Plug Gauge brings faster, more reliable thread verification to your workflow. The Go/No-Go design minimizes inspection steps, while the hardened steel body stands up to daily use, maintaining accuracy over time. This gauge helps technicians, engineers, and shop teams ensure consistent fits, reduce downtime, and improve first-pass assembly across parts that rely on precise metric threads.