The JBO Thread Plug Gauge is a precision UNEF go-no/go tool designed to verify left‑hand internal threads. Built for professionals across manufacturing, automotive, and aerospace, it delivers fast, reliable checks to confirm threaded holes meet the UNEF standard and the 7/16 x 2 size with 2B tolerance. Its simple pass/fail design makes inspection quick and repeatable, reducing rework and assembly delays.

• Go/No-Go quick conformance checks: Quickly determine if a threaded hole is in spec—comfortable “Go” fit indicates proper engagement, while a deliberate “No-Go” check flags out-of-tolerance holes for immediate corrective action.
• Durable, ergonomic construction: Rugged steel body with a knurled grip provides reliable handling in busy shops and long tool life, even in demanding environments.
• Left-hand UNEF calibration for 7/16 x 2, 2B: Specifically calibrated for left-handed UNEF threads, ensuring accurate validation and preventing mis-machined parts in critical assemblies.

Using the JBO Thread Plug Gauge streamlines thread inspection, speeds up quality checks, and helps you consistently validate threaded holes before they go into production or assembly. It supports cleaner workflows, less downtime, and greater confidence that your components will fit and function as intended in demanding applications.