The JBO Thread Ring Gauge (GO) - Metric Coarse - Left Hand - 6h - M1.4 x 0.3 is a precision tool designed to quickly verify external metric coarse threads. It’s ideal for quality control teams, machinists, and assembly technicians who need fast, reliable checks to ensure mating parts thread together correctly.

Built from hardened steel, this GO ring gauge delivers durable performance in busy workshops. Its precise dimensions endure repeated use, helping you maintain consistent inspections, reduce downtime, and keep production moving smoothly.

• Quick, reliable GO thread verification: Instantly confirm the external thread diameter against standard mates, speeding up inspections and reducing guesswork.
• Durable hardened steel construction: Designed to resist wear in demanding environments, delivering long service life and stable measurements over time.
• Left-hand metric coarse with 6h tolerance: Specifically matched to left-hand, coarse-threaded components, providing confident, repeatable checks for compatible parts.

Using the GO gauge streamlines your QC workflow by delivering clear go/no-go results for threaded components. It helps prevent mismatches, improves assembly reliability, and supports consistent, high-quality outcomes across projects.