The JBO Thread Plug Gauge is a precision tool designed to verify internal metric fine threads with fast, reliable Go/No-Go checks. It's ideal for engineers, machinists, quality inspectors, and workshop professionals who need to confirm hole tolerances quickly before assembly. With a Go/No-Go design, you can determine at a glance whether a threaded hole will accept its mating part, reducing guesswork and potential rework.

Built to endure daily workshop use, the gauge features hardened steel construction and a rugged knurled body for secure handling. The left-hand orientation and the M18 x 1 sizing (6G tolerance) ensure accurate, repeatable measurements for your metric fine-thread applications.

• Go/No-Go quick check: Quickly determine if a threaded hole meets spec, delivering clear pass/fail results to speed up inspection and minimize rework.
• Hardened steel construction with knurled grip: Durable, wear-resistant design that stands up to daily use and provides a secure, comfortable grip even when wearing gloves.
• Precise metric fine thread fit (M18 x 1, 6G, Left-Hand): Specifically sized for metric fine threads with 6G tolerance, offering reliable checks for left-hand threaded components and consistent results.

Using the JBO Thread Plug Gauge helps streamline quality checks, improve assembly confidence, and support consistent thread engagement across parts. Its robust construction and precise sizing make it a dependable addition to any workshop or production line.