The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Built for engineers, machinists, and quality teams, it quickly checks whether a threaded hole will accept the mating part without guesswork. With a Go/No-Go design, you can confirm proper thread depth and tolerance in seconds, keeping assemblies tight and reliable.

This model is specifically calibrated for left-hand threads, with M14 x 1 pitch and 6H tolerance. Crafted from hardened steel, it combines accuracy with durability for everyday workshop use and repeated inspections.

• Go/No-Go Quick-Check for Metric Fine Threads: Easily determine if a hole meets tolerance by performing go and no-go checks, reducing inspection time and preventing misfits in assemblies.
• Durable Hardened Steel Construction: Built to withstand daily wear, resist corrosion, and maintain accuracy after many insertions and extractions.
• Left-Hand Thread Calibration for M14 x 1, 6H: Specifically tailored to metric fine left-hand threads, ensuring precise interior threading checks and correct fit for this thread form.

In practice, this gauge speeds quality control, minimizes downtime, and helps you achieve consistent, reliable thread engagement across production runs, maintenance, and field service.