Introducing the JBO Thread Ring Gauge (GO) for UNC threads — Right Hand, 3A, No. 4 x 40. This GO gauge provides precise external thread diameter verification, helping machinists, inspectors, and quality teams quickly determine whether components conform to UNC standards. Built for reliability in busy environments, it supports accurate go/no-go checks across diverse industries.

• Precise UNC GO verification: Delivers reliable go/no-go checks for No. 4 x 40 UNC threads with consistent external diameter measurement, speeding up inspections and reducing guesswork.
• Durable hardened steel construction: Designed to withstand daily use in demanding shops, resisting wear to maintain long-term accuracy and tool life.
• User-friendly inspection design: Enables quick identification of properly threaded components, supporting efficient quality control and minimizing downtime.

By incorporating this GO gauge into your inspection routine, you’ll streamline threaded-part verification, improve consistency across parts, and safeguard production timelines with confidence in every measurement.