The JBO Thread Plug Gauge is a precision tool for verifying metric fine internal threads, specifically M25 x 1.5 left‑hand holes. Built for engineers, machinists, inspectors, and shop‑floor professionals, its Go/No‑Go design enables quick, decisive checks to confirm proper thread fit.

• Left Hand M25 x 1.5, 6H tolerance: Precise compatibility with left‑hand threaded components ensures accurate hole size and reduces guesswork during assembly.
• Go/No‑Go design for fast checks: Provides clear pass/fail feedback, speeding up inspection and minimizing downtime on busy production lines.
• Hardened steel construction for long‑lasting wear: Resists wear and maintains accuracy through heavy use, delivering reliable performance year after year.

Used in daily quality control, this gauge helps you catch tooling and part mismatches early, reducing rework and ensuring consistent results across batches. The robust build and simple operation mean technicians spend less time calculating tolerances and more time delivering precise, dependable components.