Meet the JBO Thread Plug Gauge — a precision inspection tool engineered to verify internal threads quickly and reliably. This gauge is specifically calibrated for left-hand Unified National Coarse (UNC) threads in the No. 8 x 32 size and 2B tolerance class, helping technicians confirm hole readiness before assembly or repair.

Its go/no-go design delivers instant pass/fail feedback, reducing inspection time and minimizing guesswork on threaded holes. With a robust, purpose-built construction, this gauge maintains accuracy through busy shop days and frequent handling.

• Go/No-Go Quick Checks: Enables fast, unambiguous acceptance or rejection of threaded holes, speeding up quality control and reducing rework.
• Left-Hand UNC Compatibility: Precisely tuned for left-hand No. 8 x 32 UNC threads, ensuring correct readings without cross-reading other thread types.
• Durable, Precision-Machined Build: Solid metal body with a knurled grip and durable finish for long life and reliable measurements in demanding environments.

This plug gauge helps streamline your workflow by delivering dependable, repeatable measurements, cutting downtime, and improving fit, performance, and overall quality across manufacturing, automotive, and aerospace applications.