Double Row Cylindrical Roller Bearings

The features and utility of the bearing will depend on the type of double row cylindrical bearing. Broadly, here are the features of each type: 

NNU Type:

• Two flanges on the inner ring, no flanges on the outer ring
• High on precision and designed to accommodate heavy radial loads at high speed. 
• Provides high degree of stiffness due to hardened surface 
• Helps allocate axial displacement in either direction.
• The components are separable which makes it ideal for seamless mounting and dismounting.

NN Type:

• Two flanges on the outer ring, no flanges on the inner ring
• Also designed to accommodate heavy radial loads at high speed. 
• Provides high degree of stiffness due to hardened surface 
• Helps allocate axial displacement in either direction. 
• Separable assembly components ideal for seamless mounting and dismounting.

Some cylindrical bearings have no flange on either the inner or the outer ring. So the rings move axially relative to each other. These can be used as floating bearings. Cylindrical roller bearings in which either inner or outer rings have two flanges on both sides, and the other ring has one, are capable of some load in one direction. The bearings are designed for maximum load capacity. With optimised design, stress distribution is uniform and edge loading is minimised. The separable parts are interchangeable. This is particularly applicable in case of double row bearings.