The JBO Thread Ring Gauge (GO) for 5/16-18 UNC is a precision go gauge designed to quickly verify the outer thread diameter and pitch of fasteners and threaded components. It helps inspectors, machinists, and quality teams confirm parts meet UNC specifications with confidence, speeding up inspections and reducing guesswork on the shop floor.

Built from hardened steel, this gauge delivers outstanding durability and wear resistance in demanding environments. Its clear go/no-go design makes it easy to use during busy production, delivering consistent, repeatable results every time.

• Fast, go/no-go verification: Quickly determine whether a thread part conforms to spec with a simple check, helping to accelerate inspections and minimize downtime.
• Durable hardened steel construction: Withstands repeated use and maintains dimensional stability for long-lasting accuracy in real-world conditions.
• Size-and-class accuracy for 5/16-18 UNC right-hand threads (3A): Precisely matched to the standard to ensure reliable measurements on common fasteners and mating components.

This GO gauge supports efficient quality control and consistent results across production runs. By providing fast, reliable checks, it helps you reduce rework, shorten lead times, and maintain high standards of fit and performance in every assembly.