The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It helps machinists, engineers, and quality inspectors quickly verify threaded holes to ensure parts assemble cleanly and consistently. With its Go/No-Go design, you can confirm both the minimum and maximum allowable thread dimensions in seconds, reducing guesswork and rework.

• Go/No-Go Verification for Quick, Reliable Checks: Instantly confirm whether a thread hole meets tolerance—Go end fits as it should, No-Go end should not—speeding setup and catching out-of-tolerance holes before assembly.
• Metric Fine Thread Precision (M18 x 0.5, 6G): Specifically tuned for metric fine threads, delivering consistent results for critical fasteners and tight tolerance applications.
• Durable Hardened Steel Construction: Built to endure daily use in busy workshops, offering long wear resistance and reliable performance over time.

Designed for reliable, repeatable results, the JBO Thread Plug Gauge helps you maintain tight quality control across production and maintenance tasks. By enabling faster, more accurate thread checks, it reduces downtime, minimizes rework, and gives you confidence in every fit—from initial assembly to field repairs.