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 spareparts2day 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.

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Last Update: Friday, March 13, 2026