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The JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 4h - M21 x 0.75 is a precision tool that helps you verify external metric threads with confidence. Whether you’re designing, manufacturing, or inspecting components, it provides quick, reliable go/no-go checks to confirm the thread size and class matches the specification. Ideal for engineers, machinists, quality inspectors, and shop personnel, it supports accurate decisions in demanding production environments.
Made from hardened steel, this GO gauge resists wear and stands up to heavy use in busy workshops, delivering long-lasting accuracy and dependable performance. Its straightforward GO design makes it easy to identify properly conforming threaded components at a glance, supporting efficient quality control and repeatable results across assemblies.
By delivering precise, repeatable measurements for external threads, this GO gauge helps streamline quality control, improve workflow efficiency, and enhance overall threading accuracy across production and maintenance processes.
Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
US$40
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