Double Row Cylindrical Roller Bearings

Double row cylindrical roller bearings are available with cylindrical or tapered bores. Their compact construction, high rigidity, high radial load capacity and low deformation under load make them especially suitable for precision machine-tool spindle supports and heavy-duty industrial equipment.

NN designs use an inner ring with guide flanges and an outer ring without flanges; NNU designs use an outer ring with guide flanges and an inner ring without flanges. Both designs allow relative axial displacement between the shaft and housing and normally use machined solid cages.

High Radial Load Carrying Capacity

Two rows of cylindrical rollers provide a large effective contact area, enabling high radial load capacity while maintaining excellent stiffness and stable load distribution.

• High radial load capacity
• Compact bearing cross-section
• High rigidity
• Low deformation under load

Non-Locating Design and Axial Displacement

The flange arrangement of NN and NNU bearings permits axial displacement within the bearing, allowing the bearing to compensate for shaft thermal expansion without introducing additional axial stress.

• Allows relative axial displacement
• Compensates for shaft thermal expansion
• Suitable for non-locating bearing positions

Representative double row cylindrical roller bearing configurations

CHG controls raceway geometry, roller diameter variation, internal clearance and cage accuracy to provide stable load distribution, low running deformation and reliable performance at precision spindle speeds.

Available precision classes : P0 · P6 · P5 · P4

Typical Applications

• Precision machine-tool spindles
• Grinding, milling and boring machines
• Rolling-mill equipment
• Industrial gearboxes and reducers
• Large electric motors and generators
• Heavy-duty industrial machinery