The JBO Thread Plug Gauge is a precision go/no-go instrument crafted for metric fine threads. It’s designed for machinists, inspectors, and assembly teams to quickly verify that internal threaded holes meet exact specifications, ensuring reliable mating with left-handed M28 x 1 components in 6H tolerance.

• Go/No-Go Quick-Check design: Quickly determine if a hole is within spec, speeding up quality checks and reducing guesswork during assembly.
• Durable hardened steel construction: Built to withstand daily workshop use while maintaining long-term accuracy and wear resistance.
• Left-Hand, M28 x 1 with 6H tolerance: Precisely sized for left-hand threads and standard internal thread tolerance, ensuring correct fit and dependable results.

With the JBO Thread Plug Gauge, you’ll streamline threaded-hole inspections, cut down rework, and maintain consistent results across parts and assemblies. Its rugged construction and exact sizing give you confidence in every measurement, supporting faster workflow, fewer defects, and improved overall reliability in manufacturing, maintenance, and quality-control environments.