The JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.3 is a precision tool used to verify external thread diameters on fasteners and machined parts, providing a reliable NoGo limit for the M4 x 0.3 thread. Made from hardened steel for durability, it features a knurled outer edge for easy handling and orientation marks to speed inspections, making it ideal for engineers, inspectors, technicians, and hobbyists who need consistent, standards-compliant results.

• Precise metric NoGo verification: Confirms the external thread diameter against the M4 x 0.3 right-hand specification, enabling quick, reliable identification of parts outside tolerance and reducing guesswork in inspections.
• Durable hardened steel construction: Built to withstand daily use in busy workshops, delivering long-lasting accuracy and wear resistance even in demanding environments.
• User-friendly inspection design: Ergonomic knurled edge and clear orientation aids fast, confident checks with minimal effort, helping you speed up quality control and minimize downtime.

With its robust build and straightforward operation, this gauge helps you streamline quality control, improve consistency across production runs, and ensure threaded components meet exact standards—delivering faster inspections, fewer rejects, and better overall results.