The JBO Thread Plug Gauge is a precision UNC Go-No/Go tool designed to inspect threaded holes and female-threaded components with speed and confidence. Sized for 1/4 x 20 right-hand UNC threads and built to 3B tolerance, it’s a practical choice for manufacturers, automotive shops, and aerospace maintenance teams who need quick, repeatable checks against Unified thread standards.

With its Go/No-Go design, inspectors can instantly confirm conformity or flag non-conforming threads, reducing guessing and rework. The durable metal body with a knurled grip delivers long-lasting performance in busy work environments, and the compact form fits neatly into standard inspection kits.

• Go/No-Go Precision Check: Quickly determine if a hole meets Go and No-Go limits, enabling fast pass/fail decisions and streamlined QC workflows.
• UNC 1/4 x 20 Right-Hand Standard: Precisely sized for common Unified thread standards, ensuring reliable real-world fit checks and easy integration with fixtures and gauges.
• Rugged, Ergonomic Construction: Durable metal body with a knurled grip for secure handling and long service life in busy shops.

Using the JBO Thread Plug Gauge helps you shorten inspection times without sacrificing accuracy. It provides a consistent, repeatable reference for quality checks, catches non-conforming parts before assembly, and supports compliance with Unified thread standards across manufacturing, automotive, and aerospace applications.