Cylindrical Roller Bearings
Cylindrical Roller bearings are similar to Ball bearings except that the rolling elements are steel rollers instead of steel balls.
Most standard cylindrical roller bearings use a steel cage to properly space the rollers around the bearing. Special precision made cages are used for applications involving extreme operating conditions, such as high loads or speeds, shock loads or vibrations. Some cages are precision machined from steel or bronze, others stamped from brass and some are now being made from high impact plastics.
The surface of a cylindrical roller is not perfectly straight, but slightly “crowned”. This improves the distribution of stress due to loads and compensates for minor misalignment between rollers and raceways. Cylindrical Roller Bearings are manufactured to both metric and imperial dimensions.
Cylindrical Roller Bearings are divided into three distinct types, Separable inner ring, Separable outer ring and Non-Separable types. In order to save space, some applications may have an outer ring and cage assembly running directly on to the shaft in which case the shaft would have to be specially hardened to take the wear. An Inner ring and cage assembly could also be installed directly into a hardened housing. We stock our standard range Cylindrical Roller bearings as complete units, even if the components are separable.
The diagram below shows the main metric configuration types for single row and double row. Cylindrical bearings are also available in Imperial sizes.
- N Series – Bearings of N type are single row cylindrical roller bearings with two fixed ribs on the inner ring that retain the rollers and cage and one smooth outer ring. This type allows axial displacement in certain limits of the shaft in relation to the housing. Therefore, N Series cylindrical roller bearings are used in non-locating bearing units. The N Series bearings have very little thrust capacity.
- NU Series – These are single row cylindrical roller bearings with two fixed ribs on the outer ring and one smooth inner ring. This type allows an axial displacement of the shaft in relation to the housing. Therefore, NU Series rolling bearings are used in non-locating bearing units. The NU Series bearings have very little thrust capacity.
- NJ Series – This type of single row cylindrical roller bearing has two fixed ribs on the outer ring and a fixed rib on the inner ring which can guide the shaft in a single axial direction.
- NUP Series – These are single row cylindrical roller bearings with two fixed ribs on the outer ring and a fixed rib and a support washer on the inner ring. This arrangement allows them to be used as locating bearings guiding the shaft axially in both directions.
- NF Series – Able to carry incidental thrust loads, this bearing type features two integral ribs on the inner ring and a single rib on the outer ring.
- NN Series – The NN design are double row cylindrical roller bearing with three fixed ribs on the inner ring that retain the rollers and cage and one smooth outer ring. This type allows an axial displacement within certain limits of the shaft in relation to the housing. NN Series Cylindrical roller bearings are used in non-locating bearing units. The NN Series bearings have a low thrust capacity.
- NNU Series – These double row cylindrical roller bearings have three fixed ribs on the outer ring and one smooth inner ring. This style allows an axial displacement within certain limits of the shaft in relation to the housing. NU Series cylindrical roller bearings are predominantly used in non-locating bearing units. The NNU Series bearings have very low thrust capacity.
Need Assistance Selecting the correct Cylindrical Roller Bearings?
If you need assistance selecting the right bearings for your particular application, please give us a call and talk to one of our knowledgeable staff. We’re here to help and problem solve for you.
