The JBO Thread Ring Gauge (NoGo) is a precision inspection tool crafted for engineers, machinists, quality teams, and workshop technicians. It verifies external metric thread diameters for fine pitches, specifically M21 x 1 right-hand threads in the 6g tolerance class, providing a clear NoGo check to confirm parts meet required standards. Designed to streamline quality control, it helps you quickly identify components that do not conform and prevent them from advancing in the manufacturing process.

Built for durability, this gauge is made from hardened steel to resist wear in demanding environments and maintain accurate results over time. Its user-friendly design supports fast, repeatable inspections, making it a reliable companion for routine thread checks, incoming inspections, and in-process quality control.

• NoGo verification for metric fine M21 x 1 right-hand threads: Quickly determine if a part’s external thread diameter is out of tolerance, enabling fast pass/fail decisions and reducing rework
• Hardened steel construction for long-lasting durability: Withstand daily use in busy shops while preserving precise dimensions and reliable performance
• Ergonomic, easy-to-read design for fast inspection: Knurled edge and clear sizing cues support secure handling and rapid, consistent checks

In practice, the JBO NoGo gauge helps you tighten control over thread quality, shorten inspection cycles, and ensure consistent fit and function across assemblies. By delivering reliable, repeatable results, it supports efficient workflows, reduces downtime, and boosts confidence that every threaded component meets your specified M21 x 1 right-hand standard.