The JBO Thread Ring Gauge (GO) for UNF left-hand threads, size 1-1/8 x 12, is a precision inspection tool designed to verify external thread diameters quickly and reliably. Built for engineers, machinists, quality inspectors, and shop technicians, it enables fast conformance checks against UNF specifications in size class 2A.

• Precise GO gauge for UNF external threads: Provides accurate diameter verification for left-hand threads, helping you confirm parts meet UNF 1-1/8 x 12, 2A specifications with speed and confidence.
• Hardened steel construction for durability: Resists wear and deformation in demanding shop environments, delivering long-lasting performance and reliable checks over time.
• User-friendly conformance identification: Designed for easy use in quality control, enabling quick determination of properly conforming components and reducing inspection time.

In practice, this ring gauge supports consistent thread quality across production runs, shortens inspection cycles, and helps your team make confident, data-driven decisions on part acceptance—every part, every time.