The JBO Thread Ring Gauge (NoGo) is a precision tool engineered to verify external UNF threads. Specifically sized for 1/4 x 28 left-hand threads in the 2A class, it helps inspectors quickly determine whether a threaded component is within tolerance or out of spec. This No-Go gauge is ideal for shops and QC labs that rely on fast, reliable pass/fail checks.

• UNF Left-Hand No-Go verification: Quickly confirms non-conforming threads to prevent improper fitment, reducing rework and ensuring parts will assemble correctly.
• 2A class, left-hand UNF compatibility: Designed to align with common automotive, manufacturing, and aerospace specifications, delivering consistent, repeatable measurements.
• Durable hardened steel construction with knurled edge: Built to withstand daily workshop use while providing a secure grip for easy handling and accurate checks.

Using this gauge simplifies quality control by delivering clear, practical results that support faster inspections and reliable assemblies. It helps you validate thread engagement with confidence, streamline your inspection workflow, and maintain consistent quality across production runs.