The JBO Thread Plug Gauge - UNJF Go-No/Go - Right Hand - 3B - 1/2 x 20 is a precision inspection tool for verifying UNJF-threaded holes. Its compact, hand-size design makes it ideal for manufacturing, automotive, aerospace, and shop-floor QC tasks, where fast, repeatable checks are essential.

With a dedicated go and no-go end, it offers a clear, tactile pass/fail indication for each hole you measure — helping you confirm correct thread engagement, proper depth, and consistent thread quality without guesswork.

• Go/No-Go quick checks: Dual ends deliver decisive pass/fail results, speeding inspections and reducing rework by eliminating guesswork on hole suitability.
• Right-hand, 3B tolerance class: Specifically designed for UNJF right-hand threads in the 3B class, ensuring reliable compatibility with common assemblies and consistent results across parts.
• Rugged, ergonomic construction: Knurled grip and precisely machined ends provide secure handling and repeatable measurements in busy work environments, supporting long service life.

Using the JBO UNJF Go-No/Go plug gauge helps streamline setups, quickly flag out-of-tolerance holes, and ensure threaded components assemble correctly, improving overall workflow, reducing downtime, and delivering dependable results batch after batch.