The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads. It provides fast, reliable Go/No-Go checks to verify threaded holes meet exact size requirements, helping assemblies fit correctly and function as intended. This makes it ideal for engineers, machinists, quality inspectors, and shop floor personnel who need quick, confident hole verification.

This left-hand variant is built for durability in busy environments. Crafted from hardened steel and finished to endure daily use, it features a 6H tolerance for M5 x 0.8 coarse threads, delivering repeatable, reliable checks time after time.

• Go/No-Go verification for metric coarse threads: Quickly confirm hole size against the M5 x 0.8 standard with a simple pass/fail check, reducing inspection time and minimizing mismatches.
• Hardened steel construction for long life: Withstands rigorous daily use while maintaining accuracy, lowering replacement costs and downtime.
• Left-hand, 6H-toleranced M5 x 0.8 design: Ensures consistent, repeatable measurements for left-hand thread applications and tight quality control across parts.

Using the JBO Thread Plug Gauge helps streamline quality control and assembly workflows. It provides clear, decisive results, reduces rework, and supports reliable part fit across production runs. The robust, wear-resistant body and straightforward Go/No-Go checks give you confidence to move parts through your process efficiently and with fewer surprises.