The JBO Thread Plug Gauge is a precision Go/No-Go inspection tool designed for metric coarse internal threads. This left-hand gauge is calibrated for M12 x 1.75 with a 6H tolerance, making it ideal for quickly verifying threaded holes during machining, assembly, and maintenance. Built for reliability, it helps ensure components fit correctly and function as intended.

Crafted from hardened steel and featuring a knurled body for a secure grip, this gauge is built to withstand daily use in busy workshops. Its durable construction helps maintain accuracy over many cycles of insertion and removal, delivering long-lasting performance you can count on.

• Go/No-Go inspection for fast, confident checks: quickly determine whether a threaded hole meets spec, reducing guesswork and rework during quality checks.
• Hardened steel construction for longevity: engineered to resist wear and corrosion, providing stable, repeatable results in demanding environments.
• Metric coarse thread focus (M12 x 1.75, 6H, left-hand): precisely tuned to your specific application to ensure consistent fitment and reliable assembly outcomes.

Using the JBO Thread Plug Gauge helps you confirm hole thread integrity efficiently, streamline workflows, and minimize downtime. Its precise calibration and rugged build translate to higher first-pass yields, fewer quality issues, and greater confidence in every threaded connection.