SKF NJ 309 ECP C4 Cylindrical Roller Bearing 45x100x25

Designed for High Radial Loads in Industrial Applications

ECP Cage Design and C4 Internal Clearance

Technical Data and Mounting Compatibility

Main Description:
The SKF NJ 309 ECP C4 is a single-row cylindrical roller bearing engineered for high radial load capacity and reliable operation in demanding industrial applications. With dimensions 45x100x25 mm (inner diameter x outer diameter x width), this bearing is widely used in gearboxes, electric motors, pumps and heavy-duty transmission systems.

As a cylindrical roller bearing of NJ design, it features two integral flanges on the outer ring and one flange on the inner ring, allowing axial displacement of the shaft relative to the housing in one direction. This makes it suitable for locating and non-locating bearing arrangements within a bearing housing (obudowa łożyskowa) or as part of a complete bearing unit (jednostka łożyskowa).

The ECP designation indicates a high-strength glass fiber reinforced polyamide cage optimized for reduced friction and smooth roller guidance. Combined with C4 internal clearance, greater than standard C3, the bearing performs reliably in applications with high operating temperatures, heavy loads or tight interference fits. Compared to a standard łożysko kulkowe, a cylindrical roller bearing provides significantly higher radial load capacity due to the line contact between rollers and raceways.

SKF manufacturing standards ensure precise geometry, consistent load distribution and wysoka trwałość under continuous operation. The NJ 309 ECP C4 is frequently selected for industrial gear drives, compressors and conveyor systems where operational stability and long service intervals are critical. Its design supports efficient lubrication, minimizes heat generation and contributes to reduced maintenance costs in B2B environments.

Key search phrases included:
SKF NJ 309 ECP C4, 45x100x25 cylindrical roller bearing, single row roller bearing, C4 clearance bearing, heavy duty industrial bearing.

FAQ

1. What does C4 clearance mean in SKF NJ 309 ECP C4?
C4 indicates internal clearance greater than C3, suitable for high temperature or heavily loaded applications.

2. How does a cylindrical roller bearing differ from a ball bearing?
A cylindrical roller bearing supports higher radial loads due to line contact, while a ball bearing (łożysko kulkowe) handles combined loads with lower radial capacity.

3. What does ECP stand for?
ECP refers to an optimized internal design with a reinforced polyamide cage for reduced friction and improved performance.

4. In which applications is NJ 309 ECP C4 commonly used?
It is used in gearboxes, motors, industrial drives, compressors and other heavy-duty industrial systems.

5. Can this bearing be used in a locating arrangement?
Yes. The NJ design allows axial displacement in one direction, making it suitable for specific shaft positioning configurations.