The JBO Thread Ring Gauge (GO) – Metric Fine, Right Hand, 6g, M138 x 2 is a precision inspection tool designed to verify external threads on fasteners and threaded components. Used by machinists, engineers, inspectors, and quality teams across industries, it provides a quick, reliable go check to confirm conformance with metric fine thread specifications.

Made with hardened steel for durability and wear resistance, this GO gauge is built to endure the demands of busy workshops. Its precise dimensions and GO capability help you identify properly formed threads with confidence, supporting consistent quality across production runs.

• Durable hardened steel construction: Withstands daily workshop use and resists wear, delivering long-lasting accuracy for thousands of inspections.
• Accurate metric fine GO gauge for fast checks: Quickly confirms external threads meet M138 x 2, 6g standards, speeding up inspection and reducing guesswork.
• Right-hand orientation and easy handling: Designed for straightforward insertion and alignment in busy QC lines, supporting repeatable, reliable results without fuss.

This gauge helps streamline quality control by delivering clear go/no-go feedback on external thread diameters, enabling faster decisions, reduced downtime, and improved consistency across operators and shifts.