The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It helps machinists, engineers, quality inspectors, and maintenance teams quickly verify threaded holes meet the M12 x 1.25 fine thread standard, ensuring reliable mating with fasteners.

This left-hand gauge is built for durability and accuracy in demanding assemblies, conforming to the 6H tolerance to ensure proper fit and predictable performance.

• Go/No-Go quick checks for metric fine threads: Streamlined inspection that clearly indicates in-tolerance vs out-of-tolerance holes, speeding setup and reducing guesswork.
• Hardened steel construction for durability: Resists wear in busy workshops, preserving accuracy and extending tool life through heavy use.
• Left-hand M12 x 1.25 (6H) compatibility: Specifically designed to verify left-handed holes to the 6H tolerance, ensuring correct fit and preventing assembly issues.

Using the JBO Thread Plug Gauge improves workflow by delivering fast, reliable assessments of hole threads, cutting down rework and returns while helping you maintain consistent, high-quality assemblies across production and maintenance tasks.