The JBO Thread Plug Gauge is a precision tool designed for metric fine threads (M28 x 0.75) in the 6H tolerance class. Perfect for inspectors, machinists, and assembly technicians, it helps verify threaded holes quickly and with confidence. The knurled, easy‑grip body and threaded ends provide simple handling for repetitive use in busy shops.

Go/No-Go testing is built in to deliver fast, decisive checks of hole threads, helping you confirm proper thread engagement and avoid misfits during assembly. Crafted from hardened steel, this gauge is built to stand up to daily use in demanding environments without sacrificing accuracy.

• Go/No-Go thread validation: Quick pass/fail checks for metric fine threads, speeding inspections and reducing guesswork.
• Right-Hand M28 x 0.75 compatibility: Precisely sized for right‑hand metric fine threads, ensuring accurate gauging and consistent results.
• Durable hardened steel construction: Resists wear and maintains accuracy over many inspections in busy workshop conditions.

Using this gauge helps streamline threaded-hole inspections, shorten setup times, and support reliable, repeatable results across projects—from initial machining to final assembly.