JBO Thread Plug Gauge - Metric Fine Go/No-Go is a precision inspection tool designed for metric fine threads. It helps technicians, engineers, and quality teams verify threaded holes quickly and confidently. The Go/No-Go design provides a fast pass/fail check to ensure holes meet exact pitch and depth requirements for reliable mating with M21 x 0.5 threads in a right-hand configuration (6H).

• Go/No-Go efficiency: Quickly confirm whether a threaded hole meets the exact pitch and depth standards, speeding up quality checks and reducing guesswork during assembly.
• Hardened steel durability: Built for regular workshop use with wear-resistant construction that maintains accuracy over time and through many inspections.
• Metric fine thread standard: Specifically calibrated for M21 x 0.5 fine threads and 6H tolerance, ensuring reliable compatibility with precision components and tight tolerances.

This gauge supports streamlined inspection workflows, helping you achieve consistent fit and function across parts. By providing a clear go/no-go result, it minimizes rework, shortens setup times, and strengthens confidence in every threaded assembly.