The JBO Thread Plug Gauge is a precision inspection tool built for metric coarse threads. This left‑hand, go/no‑go gauge is specifically designed to quickly verify threaded holes against M4 x 0.7 coarse thread standards, helping ensure proper fitment and reliable component performance in assemblies. With the 6H specification, it’s tailored for consistent checks in quality control and manufacturing environments.

• Go/No-Go inspection design: enables fast, clear pass/fail checks of threaded holes, reducing guesswork and downtime during assemblies or in‑process quality checks.
• Left‑hand, metric coarse compatibility (M4 x 0.7, 6H): engineered to match your coarse-thread applications exactly, so you can trust fits on left-handed or specialized components without confusion.
• Hardened steel for durability: built to endure repetitive use in busy workshops, maintaining accuracy and extending tool life even under demanding inspection schedules.

Used consistently, this gauge helps streamline inspection routines, minimize rework, and ensure that threaded holes meet exact standards—giving you confidence in part mating, assembly reliability, and overall manufacturing performance.