The JBO Thread Plug Gauge is a precision inspection tool designed for metric coarse threads. It helps engineers, machinists, inspectors, buyers, and hobbyists verify threaded holes quickly and with confidence.

This Go/No-Go gauge is right-hand, sized for M9 x 1.25 coarse threads and built to 6G tolerance, so you can confirm fit and function of components in a single check. Its hardened steel construction delivers lasting performance in demanding shop environments.

• Go/No-Go design for fast, objective checks: Quickly verify hole threads meet spec in seconds, reducing guesswork and rework in assemblies.
• Hardened steel construction for durability: Withstand daily use, resist wear, and provide long-lasting accuracy in busy workshop environments.
• Right-hand M9 x 1.25 coarse thread compatibility: Aligns with common metric coarse threads to ensure reliable fit verification of components that use this size.

Using this gauge, you can streamline your inspection workflow, confirm thread quality at a glance, and prevent incorrect assemblies. The durable construction and precise Go/No-Go checks help you maintain consistent quality, reduce downtime, and speed up production or assembly projects across teams.