The JBO Thread Ring Gauge (NoGo) for UNJF threads is a precision tool designed to verify external thread diameters on fasteners, fittings, and machined components. It helps engineers, inspectors, and shop floor teams quickly determine whether a part conforms to required thread size and tolerance, supporting consistent quality across assemblies.

Engineered for durability and reliability, this gauge uses hardened steel to resist wear in demanding environments. It is specifically sized for left-handed UNJF threads in the 1/2 x 20 range (2A), providing a clear, repeatable reference for your QC checks and incoming inspection.

• Durable hardened-steel construction: Resists wear and deformation, delivering long service life even in busy workshop environments.
• Fast, conclusive conformance checks: Simple, intuitive design lets you quickly identify parts that meet or fail to meet the specification, reducing inspection time and downtime.
• UNJF left-hand size accuracy: Precisely matched to 1/2 x 20 left-hand threads in the 2A class, ensuring reliable measurements across parts and assemblies.

This gauge serves as a trusted reference in quality control workflows, helping you streamline inspections, reduce rework, and maintain consistent thread integrity throughout production and maintenance operations.