NJ311 ECP/C4 SKF Cylindrical Roller Bearing 55x120x29

NJ design and operating characteristics

The NJ311 ECP/C4 cylindrical roller bearing from SKF is a single row bearing designed for high radial loads combined with high operating speeds. With dimensions 55x120x29, this bearing is commonly used in industrial drive systems where stability and durability are essential.

The NJ design, with two integral flanges on the outer ring and one flange on the inner ring, allows the bearing to locate the shaft axially in one direction. The increased C4 internal clearance makes it suitable for applications involving elevated temperatures, high speeds and heavy dynamic loads.

Industrial applications

The SKF NJ311 ECP/C4 bearing is widely used in industrial applications such as electric motors, gearboxes, fans, production machinery and heavy-duty drive systems. Compared to a standard ball bearing, the cylindrical roller design provides significantly higher radial load capacity and improved system rigidity.

Its separable construction simplifies installation and maintenance, which is particularly important for reducing downtime. The bearing can be used as part of a complete bearing unit together with a suitable bearing housing.

Key benefits for B2B customers

For B2B customers, the NJ311 ECP/C4 offers predictable performance, low friction and high durability. The robust design supports continuous operation under demanding industrial conditions. It is a reliable solution for machine builders, system integrators and maintenance departments.

Main product description

The NJ311 ECP/C4 SKF cylindrical roller bearing 55x120x29 is engineered for demanding industrial environments where precise shaft guidance and high radial load capacity are required. The NJ construction enables axial shaft location in one direction while maintaining excellent radial load performance.

The ECP cage ensures stable roller guidance, and the C4 clearance allows safe operation under thermal expansion and high-speed conditions. This bearing is suitable for new machine designs as well as replacement applications, delivering consistent performance and long service life.

FAQ - frequently asked questions

What loads can the NJ311 ECP/C4 handle?
It supports high radial loads and locates the shaft axially in one direction.

What does C4 internal clearance mean?
C4 indicates increased internal clearance for high-temperature and high-speed operation.

How does NJ design differ from NU design?
NJ bearings locate the shaft axially in one direction, while NU bearings allow axial displacement in both directions.

Is this bearing suitable for continuous operation?
Yes, it is designed for long-term industrial use.

Where is this bearing commonly used?
In electric motors, gearboxes and industrial machinery.