The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. Built for left-hand applications, it is sized M27 x 2 with a 6H tolerance, making it ideal for ensuring threaded holes meet exact specifications in machining, assembly, and QA environments.

Whether you’re an engineer, machinist, quality inspector, or maintenance professional, this gauge delivers quick, reliable go/no-go checks that speed up setups and reduce guesswork.

• Go/No-Go quick-check: Quickly verify thread hole acceptance with a simple go/no-go test, speeding up quality control and reducing downtime.
• Metric fine thread compatibility (M27 x 2, 6H, left-hand): Precisely sized to match left-hand metric fine threads, ensuring correct fit decisions and preventing mis-match during assembly.
• Hardened steel construction: Built for long life in workshop conditions, offering wear resistance and stable performance even after repeated use.

Using this gauge, you’ll streamline your threading checks, minimize rework, and maintain consistent hole quality across parts. The durable construction means reliable performance in busy workshops, while the Go/No-Go design helps teams make fast, confident pass/fail decisions during production or repair work.