The JBO Thread Plug Gauge is a precision tool built for verifying internal metric threads. Designed for M39 x 3 fine-pitch holes with right-hand threads, it delivers fast, reliable Go/No-Go checks to confirm that a hole meets the 6H tolerance and will accept mating components without interference. It’s an ideal instrument for machinists, quality control teams, and hobbyists who demand consistent thread accuracy in production or repair work.

• Go/No-Go Quick-Check: Instantly confirms whether a threaded hole meets the 6H internal thread tolerance, reducing guesswork and speeding up inspection without sacrificing accuracy.
• Hardened Steel Durability: Built to withstand frequent use, resist wear, and maintain precise dimensions over time for dependable performance in busy shops.
• Metric Fine-Thread Compatibility (M39 x 3) Right-Hand: Specifically engineered for metric fine threads with a right-hand orientation, ensuring reliable fit and consistent results with standard M39 x 3 components.

Using this gauge helps streamline quality checks, minimize rework, and support consistent assembly across parts and projects. Its robust construction and precise Go/No-Go design empower you to verify thread engagement quickly, improve workflow efficiency, and maintain high standards in machining, manufacturing, or repair environments.