The JBO Thread Ring Gauge (GO) - Metric Fine, Right Hand - 6g - M120 x 4 is a precision metrology tool designed to verify external thread diameters to metric fine standards. It’s ideal for machine shops, manufacturers, quality control teams, and skilled hobbyists who need reliable, repeatable thread checks.

Crafted for durability and accurate results, this gauge features a meticulous design with precise dimensions that support efficient inspection of threaded components. Built from hardened steel, it resists wear and maintains tight tolerances even after heavy use in demanding environments. Its simple, user-friendly form makes it easy to identify properly conforming components at a glance, supporting fast, confident QA decisions.

• Precise external-thread GO gauge: Delivers reliable go/no-go checks for metric fine threads, helping you confirm parts meet M120 x 4 standards quickly and consistently.
• Hardened steel construction: Designed for long life in busy workshops, offering excellent wear resistance and durability under daily inspection use.
• Fast, user-friendly inspections: Enables quick identification of conforming components, reducing inspection time and minimizing downtime in production environments.

Whether you’re inspecting fasteners, fittings, or precision components, this ring gauge helps you maintain consistent quality, streamline inspection workflows, and support confident manufacturing decisions.