The JBO Thread Plug Gauge is a precision Go/No-Go gauge designed for metric fine threads, specifically calibrated for M8.5 x 0.5 right-hand threads. Use it to quickly verify threaded holes meet the required tolerance before assembly, helping you confirm fit and function with confidence.

Built for everyday workshop use, the gauge features a hardened steel body with two calibrated ends for quick Go and No-Go checks in a single tool. This arrangement delivers fast, repeatable results and supports consistent quality across parts, especially where tight tolerances matter.

• Go/No-Go quick-check for fast validation: Instantly confirms whether a hole accepts the go limit and rejects the no-go limit, reducing inspection time and the risk of misfits.
• Calibrated for M8.5 x 0.5 metric fine threads (6H, right-hand): Ensures accurate, consistent readings for this thread spec, helping prevent mismatches in assembly.
• Durable, hardened steel body with knurled grip: Built to withstand daily use, and the textured surface provides secure handling and quick alignment even with gloves on.

This gauge helps you speed up setup, reduce rework, and maintain tight tolerances across production runs. With its rugged construction and straightforward operation, it’s a reliable, repeatable tool for engineers, machinists, inspectors, and maintenance teams looking to improve workflow and part compatibility.