The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Specifically engineered for M28 x 2 left-hand holes, this Go/No-Go gauge helps shops and production teams quickly verify thread accuracy and ensure a reliable fit in assemblies. Built with hardened steel for long-term wear resistance, it stands up to daily use in busy manufacturing environments.

• Go/No-Go design for fast verification: quickly confirm whether a threaded hole meets the specified limits, reducing inspection time and decision making on the line.
• Left-hand metric fine thread compatibility: precisely sized for M28 x 2 left-hand threads with 6H tolerance, ensuring accurate checks where right-hand gauges can’t read correctly.
• Durable hardened steel construction: engineered for lasting performance in demanding settings, resisting wear and maintaining consistent, repeatable results.

Used in quality control, maintenance, and assembly workflows, this gauge helps you identify out-of-tolerance holes before they become costly rework. Its straightforward Go/No-Go use provides clear pass/fail feedback, supporting faster setup, fewer mistakes, and dependable results across repetitive tasks and critical fits.