The JBO Thread Plug Gauge is a precision tool for inspecting metric fine-threaded holes. It is specifically designed for left-hand M18 x 1 threads and aligns with the 6H internal-thread tolerance, helping you verify parts fit exactly.

• Go/No-Go Design for Fast Tolerance Checks: Quickly determine if a hole is within spec with simple go/no-go checks, reducing guesswork and rework.
• Metric Fine Thread Focused (M18 x 1 Left-Hand): Precisely engineered for metric fine threads and left-hand orientation, ensuring accurate verification of your M18 x 1 threaded holes.
• Hardened Steel Construction for Durability: Built to resist wear and maintain accuracy over many inspections, delivering long-lasting reliability.

The gauge helps streamline your inspection workflow by providing clear, repeatable results that support fast setup and consistent assembly quality. With its robust construction and precise design, this gauge is a dependable tool for engineers, machinists, quality staff, and serious hobbyists working with metric fine threads.