NTN 6311

NTN 6311 Deep Groove Ball Bearing Description The NTN 6311 is a single-row deep groove ball bearing known for its versatility and robust performance. Manufactured in Japan, this bearing is engineered to high precision standards for use in a wide variety of industrial and mechanical applications. Its open design allows for easy lubrication and makes it suitable for high-speed operations where low friction is critical. Specifications Manufacturer: NTN Part Number: 6311 Type: Deep Groove Ball Bearing Bore Diameter (d): 55 mm Outer Diameter (D): 120 mm Width (B): 29 mm Seals/Shields: None (Open type) Material: Steel Label Info Brand: NTN Model: 6311 Application This bearing is commonly used in electric motors, pumps, gearboxes, and general machinery where radial and axial loads are present. Country of Origin Made in Japan. CO2 Impact Opting for this pre-owned bearing saves approximately 2.7 kg of CO2 compared to manufacturing a new one, supporting sustainable industrial practices. Availability This item is in stock and ready for immediate dispatch. Order now from profideals for expert support and fast delivery. FAQ What does the ‘open’ design of the 6311 bearing mean for its application? An open design has no seals or shields. This makes it ideal for clean operating environments where lubrication (grease or oil) is supplied by the surrounding application. It also results in lower friction and higher speed capabilities compared to sealed bearings. What is the standard clearance for an NTN 6311 bearing and when would I need a different one like C3? The standard clearance is ‘Normal’ (CN). A C3 clearance, which is greater than normal, is typically required for high-speed applications or where there is a significant temperature difference between the inner and outer rings, to accommodate for thermal expansion and prevent seizure. Can I use oil or grease lubrication with this NTN 6311 bearing? Yes, this open bearing is designed for both oil and grease lubrication. The choice depends entirely on the application’s specific requirements for speed, load, and operating temperature. profideals is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners. Last Update: Friday, March 13, 2026