The JBO Thread Plug Gauge is a UNF Go-No/Go plug gauge designed for right-hand threads, sized 5/16 x 24 with 3B tolerance. It is crafted to quickly verify threaded holes meet Unified thread standards, helping you confirm fitment before assembly or production runs.

Designed for a wide range of users—from engineers and quality inspectors to machinists, maintenance professionals, and hobbyists—the gauge delivers dependable, fast check results that reduce inspection time and rework across manufacturing, automotive, and aerospace applications.

• Go/No-Go Quick Conformance Check: The go/no-go design provides immediate pass/fail indication for UNF threads, speeding up inspections and reducing guesswork.
• Durable, Comfortable Construction: Knurled grip and robust metal body withstand daily shop use, delivering reliable checks with smooth operation.
• Exact UNF 5/16 x 24 Right-Hand 3B sizing: Precise plug dimensions align with Unified thread standards, ensuring consistent results across parts and QA checks.

With the JBO thread plug gauge in your toolkit, you’ll streamline threaded-hole inspections, minimize rework, and help ensure every fastener fits correctly in production and assembly. Its robust design supports repeatable, accurate measurements in busy workshops, aerospace and automotive facilities, and performance-driven manufacturing environments.