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Additional information for specific bearing types and performance classes

Hybrid bearings

The higher values for the modulus of elasticity of rolling elements made of silicon nitride decreases the contact area in the raceways to significantly reduce rolling and sliding friction. Additionally, the lower density of ceramic rolling elements, when compared with steel, reduces the centrifugal forces, which also may reduce friction at high speeds.

Standard hybrid ball bearings

Using the equations given under The SKF model for calculating the frictional moment, the frictional moment for hybrid angular contact ball bearings can be calculated by multiplying the geometric constants R3 and S3 of the all-steel bearings by a factor 0,41 (that is 0,41 R3 and 0,41 S3, respectively).
Hybrid deep groove ball bearings in high speed applications are usually preloaded axially. Under these conditions, hybrid deep groove ball bearings behave like angular contact ball bearings with a similar reduced frictional moment. SKF recommends contacting the SKF application engineering service when calculating the frictional moment for hybrid deep groove ball bearings.

Hybrid super-precision bearings

For information about the frictional moment for SKF super-precision bearings, contact the SKF application engineering service.

SKF Energy Efficient bearings

To obtain values for the frictional moment for SKF Energy Efficient (E2) bearings, SKF recommends using the SKF Bearing Calculator.

Y-bearings (insert bearings)

To obtain values for the frictional moment for Y-bearings, SKF recommends using the SKF Bearing Calculator.

Needle roller bearings

To obtain values for the frictional moment for needle roller bearings, SKF recommends using the SKF Bearing Calculator.

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