The JBO Thread Ring Gauge (GO) – Metric Coarse, Right Hand, 6g, M42 x 4.5 is a precision tool designed for reliable go/no-go verification of external threads. It’s ideal for machinists, inspectors, and quality teams who need fast, accurate checks to ensure fasteners and components meet exact specifications.

Made from hardened steel, this GO gauge delivers exceptional durability for everyday use in busy shops and QC labs. Its straightforward design supports quick setup and repeatable measurements, helping you maintain consistent thread quality and reduce rework across production runs.

• Exact GO verification for metric coarse threads (M42 x 4.5, 6g, right-hand): Enables fast, reliable checks to confirm proper thread fit and tolerance alignment, minimizing guesswork and nonconforming parts.
• Hardened steel construction for long service life: Built to resist wear and maintain accuracy through heavy daily use in demanding workshop environments.
• Ergonomic, user-friendly design for quick inspections: Knurled outer surface provides a secure grip and smooth internal threading allows rapid, repeatable checks with minimal setup.

In your workflow, this gauge delivers confidence—quickly verifying that metric coarse threads meet the required standard so assemblies fit correctly, quality is ensured, and production stays on schedule. Its durable construction supports lasting performance, making it a reliable cornerstone of any precision engineering or quality control toolkit.