The JBO UNC Go-No/Go Thread Plug Gauge is a precision inspection tool designed to verify internal threads in holes and housings that use 1/4-20 UNC right-hand threads with class 2B tolerance. It’s ideal for manufacturing, automotive, and aerospace quality teams that need fast, reliable go/no-go checks to confirm thread acceptance or rejection.

Designed with a sturdy two-ended, knurled body, this compact gauge provides easy handling in tight spaces and lets technicians perform Go (conforming) and No-Go (non-conforming) checks without removing the gauge from the workpiece. It’s machined to tight Unified thread standards, ensuring consistent results across batches and over time.

• Go/No-Go quick checks: The two ends are sized for 1/4-20 UNC right-hand threads, enabling immediate pass/fail decisions to verify proper thread fit and prevent incorrect assemblies.
• Precise, repeatable measurements: Built to exact thread standards with 2B class tolerance, delivering consistent results across operators and production runs.
• Durable, user-friendly construction: Rugged design with a knurled grip and dual ends for easy handling in busy shop environments, designed for reliable use day after day.

Using the JBO Thread Plug Gauge helps you speed up thread verification, reduce rework, and improve confidence in threaded assemblies. It supports tighter quality control, smoother workflows, and better overall performance in your manufacturing or maintenance processes.