The JBO Thread Plug Gauge (GO) is a precision tool designed to verify threaded holes with metric fine threads. It is ideal for machinists, inspectors, and maintenance teams who need fast, reliable go checks to confirm holes meet the M42 x 1.5 specification and 4H tolerance. With its right-hand threading, it integrates seamlessly into standard inspection routines.

Constructed from hardened steel, this GO gauge delivers outstanding wear resistance and long service life in busy workshops. The knurled body provides a secure grip for quick, repeatable insertions, helping to minimize inspection time and reduce the chance of misreads during quality control.

• Precise M42 x 1.5 Metric Fine GO Gauge: Verifies threaded holes to the exact GO size for M42 x 1.5 threads, enabling fast, confident go/no-go checks and adherence to specifications.
• Hardened Steel Durability: Built to endure repeated use and harsh conditions, delivering consistent accuracy and extended tool life in demanding environments.
• Right-Hand, 4H Alignment for Consistency: Designed to match standard 4H thread class and right-hand threads, ensuring compatibility with production parts and other gauges for repeatable results.

Using this gauge in your inspection process helps you quickly confirm hole readiness, reduce guesswork, and minimize rework. The robust construction and precise dimensions deliver consistent results across shifts and operators, improving workflow and overall accuracy in threaded-hole assemblies.