The JBO Thread Plug Gauge is a precision Go/No-Go tool designed for metric fine threads. It is calibrated for M14 x 1.25 and excels in manufacturing, assembly, and quality inspection where a precise thread fit is essential.

This left-hand, 6G gauge combines robust hardened steel construction with a compact knurled handle, delivering dependable measurements in busy shop environments and tight spaces.

• Go/No-Go quick verification: Quickly confirm if the M14 x 1.25 hole is within tolerance, enabling faster decisions and reducing rework.
• Durable hardened steel construction: Built to endure daily use, resisting wear and maintaining accuracy over time for reliable inspections.
• Left-hand thread compatibility: Specifically suited for left-hand threaded applications, ensuring correct engagement and measurement where standard gauges may fall short.

Designed to streamline workflows, this gauge helps you verify hole readiness with confidence, shorten inspection cycles, and maintain consistent results across jobs—from precision assemblies to high-volume production. With its focused metric fine-thread calibration and rugged build, you gain a reliable, long-lasting tool that supports accurate, repeatable measurements every time.