The JBO Thread Plug Gauge is a precision inspection tool designed for metric fine threads. It’s ideal for machinists, quality inspectors, and assembly teams who need fast, reliable validation of threaded holes for M18 x 1.5 right-hand threads.

Made from hardened steel, this gauge resists wear and stays accurate through repeated use. The knurled, textured body ensures a secure grip for precise insertion and removal in tight holes, improving handling in busy workshops.

• Go/No-Go Thread Check: Quickly determine whether a hole is within specification—pass means acceptable, fail means rework, reducing inspection time and improving overall throughput.
• Durable Hardened Steel Construction: Built for long life in workshop conditions, resisting wear and preserving accurate dimensions for reliable results over time.
• Metric Fine-Thread Compatibility (Right-Hand, M18 x 1.5, 4H): Specifically sized for standard metric fine threads with a right-hand orientation and 4H tolerance, enabling accurate, repeatable measurements and easy setup.

Using this gauge supports faster, more consistent workmanship. It helps you verify hole readiness early in production, minimize downtime, and deliver trustworthy results that you can rely on for dependable fits and fewer quality issues.