The JBO Thread Plug Gauge is a precision Go/No-Go gauge designed to quickly and reliably inspect left-hand UNC threads. Sized for 1/2 x 13 with a 2B tolerance, it helps verify threaded holes meet Unified thread standards in demanding industries like manufacturing, automotive, and aerospace. Its dual-ended design makes GO and NO-GO checks fast and straightforward, reducing guesswork during quality control.

• Go/No-Go quick checks: Instantly identify conforming versus non-conforming threads, speeding up inspections and reducing rework in busy production environments.
• Left-Hand UNC 1/2 x 13, 2B tolerance: Precisely matched to your left-hand UNC holes, ensuring accurate acceptance testing and reliable fitment across parts and assemblies.
• Dual-ended with textured grip: Durable, easy-to-hold design that provides repeatable measurements in real-world shop conditions, even after long shifts.

Designed for dependable performance across QC and assembly workflows, this gauge helps you validate hole threads early, prevent mismatches, and maintain consistent quality across production runs. It supports faster checks, clearer pass/fail decisions, and more confident purchasing and assembly decisions.