The JBO Thread Plug Gauge is a left-hand, metric coarse thread go/no-go inspection tool designed to verify threaded holes quickly and reliably. It targets professionals and hobbyists working with M2 x 0.4 coarse threads (6H) and provides a clear pass/fail indication of hole size and thread fit.

Built from hardened steel for long life, the gauge resists wear through repeated use in demanding environments. Its knurled body offers a secure grip and easy maneuvering in tight spaces, so you can check holes without removing parts or guessing about tolerances.

• Go/No-Go design for fast, confident hole checks: Quickly determine if a hole accepts the thread by performing go and no-go checks, reducing inspection time and guesswork.
• Hardened steel construction for durability: Built to withstand daily shop use, delivering consistent accuracy and reducing the need for replacement gauges.
• Metric coarse sizing: M2 x 0.4, 6H, left-hand orientation: Ensures you’re inspecting the exact thread standard required, enabling reliable, repeatable results in your metric assemblies.

This precision gauge helps streamline quality control and assembly workflows, delivering quick, reliable results that improve fit, function, and overall production efficiency. With its durable build and straightforward go/no-go checks, you can trust this gauge to support accurate hole inspection across multiple projects.