The JBO Thread Plug Gauge is a precision tool designed for fast, reliable inspection of metric fine threads. Specifically configured for M21 x 0.75 right-hand internal threads, this Go/No-Go gauge helps shop floors, QA labs, and workshops verify threaded holes quickly and with confidence. With two ends designed for go and no-go checks, you can determine correct thread engagement in moments, reducing guesswork and setup time.

• Go/No-Go efficiency: Quickly verify whether each internal thread meets both the minimum and maximum engagement criteria, delivering an instant pass/fail result to speed up inspections and cut downtime.
• Metric fine thread precision: Specifically calibrated for M21 x 0.75, ensuring accurate, repeatable checks that prevent mismatches and costly rework in precision assemblies.
• Rugged, user-friendly construction: Hardened steel body with a knurled grip and two ends for straightforward handling, delivering long wear life and reliable performance in busy workshop environments.

Using the JBO Metric Fine Thread Go/No-Go Plug Gauge helps you streamline setup, confirm thread integrity before mating parts, and maintain consistent results across production runs. Its targeted design for M21 x 0.75 right-hand threads supports confident decisions in manufacturing, quality control, and assembly, reducing guesswork and promoting dependable, repeatable finishes.