The JBO Thread Ring Gauge (GO) — Metric Fine is a precision tool for quick, reliable checking of external left-hand metric fine threads on fasteners, fittings, and machined components. It provides a clear GO reference so engineers, inspectors, and shop personnel can confirm parts meet the M38 x 2 specification with confidence. Precisely calibrated to the 6g tolerance class, this gauge supports accurate, repeatable inspections in demanding environments.

• Precise GO verification for metric fine threads: Quickly determine whether an external thread diameter meets the GO size, speeding inspections and reducing guesswork on threaded components.
• Rugged hardened steel construction: Built to resist wear in busy workshops, delivering consistent accuracy and long service life even under daily use.
• User-friendly, intuitive design: Makes it easy to identify conforming parts at a glance, streamlining quality checks and improving workflow across production and repair tasks.

Used as part of a quality-control routine, this gauge helps you achieve repeatable, reliable results, minimize downtime, and ensure threads align with standards on every part. Its durable build and precise sizing give you confidence that measurements are correct, reducing rework and speeding up downstream processes.