SKF Hybrid Ceramic Cylindrical Roller Bearings: High-Speed, Heavy Load Solutions for Electric Motors and Severe Operating Conditions
SKF Hybrid ceramic cylindrical roller bearings:

• Are separable
• Are suitable for high speeds
• Accommodate heavy radial loads
• Accommodate axial displacement (fig. 1)
• Are commonly used in electric motors, especially traction motors, and in applications running under severe operating conditions

The NU design cylindrical roller bearing, which has two integral flanges on the outer ring and no flanges on the inner ring, is the standard basic design for hybrid cylindrical roller bearings (fig. 2).

SKF hybrid cylindrical roller bearings are fitted with one of the following cages:

• A glass fibre reinforced PA66 cage, window-type, roller centred (designation suffix P)
• A glass fibre reinforced PEEK cage, window-type, roller centred (designation suffix PH)
• A machined brass cage, riveted, roller centred (designation suffix M)
• A machined brass cage, window-type, inner or outer ring centred (depending on bearing design) (designation suffix ML)

For additional information, refer to Cages.

When used at high temperatures, some lubricants can have a detrimental effect on polyamide cages. For additional information about the suitability of cages, refer to Cages.

Hybrid bearings with special steel rings and coatings

For specific application requirements, hybrid bearings can be customized:

• Bearing rings stabilized for temperatures ≤ 300 °C (570 °F)
• Bearing rings made of through-hardened stainless steel for enhanced corrosion and wear-resistance and with good high-temperature properties
• Bearing rings made of through-hardened stainless steel for cryogenic temperatures
• Bearing rings made of high-temperature tool steel
• Ring coating with zinc chromate or thin dense chromium for corrosion protection
• Ring coating based on molybdenum for low friction, especially in vacuum or gas applications