The JBO Metric Fine Thread Go/No-Go Thread Plug Gauge is a precision inspection tool designed to verify metric fine threads quickly and reliably. Suitable for engineers, machinists, and quality-focused shops, it tests threaded holes to confirm they accept an M4 x 0.5 thread within the 6G tolerance. The Go/No-Go design lets you confirm plugging and rejection at a glance, speeding up quality control and ensuring consistent fits in assemblies.

• Fast Go/No-Go Verification: Quickly determine if a hole accepts the M4 x 0.5 thread within the 6G class, reducing inspection time and preventing assembly issues.
• Durable Hardened-Steel Construction: Built to withstand daily shop use and resist wear, maintaining accuracy even after many insertions.
• Right-Hand Metric Fine Thread Compatibility: Specifically engineered for right-hand M4 x 0.5 applications, delivering reliable results across standard metric fine-thread projects.

This plug gauge provides a straightforward, reliable means to verify thread quality, streamline your workflow, and improve fit consistency across assemblies. By delivering fast, decisive checks, it helps technicians catch misfits before they advance to assembly, reducing rejects and rework. The robust design supports long-term use in demanding environments, making it a dependable addition to any quality control or manufacturing toolkit.