The JBO Thread Ring Gauge (GO) is a precision tool designed to quickly verify external thread diameters on fasteners and threaded components. This GO gauge is tailored for Metric Fine threads, specifically M4 x 0.5, and accommodates left-hand thread configurations to support a range of applications. Machined to the 6g tolerance class, it provides reliable Go checks and consistent results across tasks.

Built from hardened steel with careful finishing, it resists wear and maintains accuracy through demanding, everyday use in workshops or production lines. The ring design offers a straightforward, intuitive indication of conforming parts, making quality-control checks fast and approachable for engineers, technicians, and hobbyists alike.

• Quick Go-Check for external threads: Quickly confirms whether the thread crest diameter meets the Go limit, enabling fast acceptance decisions during QC and assembly.
• Metric Fine Thread, M4 x 0.5, Left-Hand Ready: Specifically tuned for M4 x 0.5 fine pitch and left-hand threads, ensuring correct engagement and reliable measurements on the intended components.
• Durable Hardened Steel Construction: Wears slowly, resists deformation, and stays accurate after repeated inspections, improving longevity and value in busy workplaces.

Using this gauge helps you streamline inspections, reduce guesswork, and maintain consistent thread quality across batches. Its robust build and straightforward operation give you confidence to pass parts promptly, cut downtime, and meet stringent standards without sacrificing accuracy or workflow speed.