The JBO Thread Plug Gauge is a precision go-no-go gauge designed to verify UNC threads in right-hand holes sized 7/8-9. Built for reliability in demanding environments, it helps technicians in manufacturing, automotive, and aerospace ensure threaded holes meet Unified thread standards before assembly.

• Fast, go/no-go verification: Quickly determine whether a 7/8-9 UNC threaded hole conforms to spec, speeding up inspections and reducing rework.
• Durable, user-friendly construction: Knurled body and robust ends provide a secure grip and long life in busy shop environments, even with frequent handling.
• Standards-aligned precision: Engineered to the 3B tolerance class for consistent, repeatable results when checking right-hand UNC threads.

This plug gauge helps you streamline quality checks, improve workflow, and increase confidence that every threaded hole will perform as intended in critical assemblies.