The JBO Thread Plug Gauge (Go/NoGo) is a precision inspection tool designed to verify NPT threaded pipe connections quickly and reliably. It’s ideal for plumbers, fabricators, oil and gas technicians, and manufacturing teams who need to confirm that fittings will seal properly and mate correctly.

With a right-hand thread and a 1 1/2 x 11.5 size, this Go/NoGo gauge delivers clear pass/fail results for each threaded connection. The knurled, durable body provides a secure grip for easy insertion in tight spaces, while hardened steel construction ensures long life in demanding environments.

• Go/NoGo design for fast conformity checks: Quickly identify conforming versus non-conforming threads, reducing inspection time and avoiding misfit parts in assembly or repair work.
• NPT-specific size and right-hand geometry: Precisely matched to 1-1/2 in NPT with 11.5 TPI, delivering consistent, reliable assessments of fit and sealing capability.
• Hardened steel construction with a textured grip: Built to withstand daily use on busy job sites, resisting wear and corrosion while offering a secure handle for accurate, repeatable measurements.

Using this gauge streamlines quality control across plumbing, oil and gas, and manufacturing workflows. It helps you confirm thread integrity at the source, speeds up assembly, and supports leak-free, reliable connections—all with durable construction you can trust for the long haul.