NJ 311 ECP/C4 SKF Cylindrical Roller Bearing 55x120x29

NJ design and operating characteristics

The NJ 311 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 widely used in industrial drive systems where shaft stability and durability are critical.

The NJ design, featuring 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 this bearing suitable for applications with elevated temperatures, high speeds and heavy dynamic loads.

Industrial applications

The SKF NJ 311 ECP/C4 bearing is commonly used in industrial applications such as electric motors, gearboxes, production machinery, fans 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 service operations and downtime reduction. The bearing can operate as part of a complete bearing unit together with a suitable bearing housing.

Key benefits for B2B customers

For B2B customers, the NJ 311 ECP/C4 offers predictable performance, low friction and long service life. The robust design reduces wear and supports continuous operation under demanding industrial conditions. It is a reliable choice for machine manufacturers, system integrators and maintenance departments seeking proven bearing solutions.

Main product description

The NJ 311 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 the bearing to support radial loads while providing axial location in one direction.

The ECP cage ensures stable roller guidance, while 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 and modernization projects, offering consistent performance and high reliability.

FAQ - frequently asked questions

What loads can the NJ 311 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 temperatures 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 most commonly used?
In electric motors, gearboxes and heavy industrial machinery.