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Determination of 
Bearing Size

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Design - pv-range - Calculation procedure nominal service life -
Surface load - Velocity - Load capacity - Load factor - Temperature - Roughness - Example

Determination of bearing size

Roughness of the Mating Surface

When deciding on the material to be used and the surface roughness of the mating surfaces, the conditions under which the bearing system is to operate are of considerable importance.

In most cases, soft carbon steels with polished surfaces will be adequate. For demanding applications, hardened mating surfaces with a minimum surface hardness of 50 HRC or featuring a surface treatment by hard chrome plating, nickel plating etc. are of great advantage. In these cases, Ra should not exceed 0.3 µm (12 µin) and Rz should not exceed
2 µm (80 µin).

Improved surface finishes will improve the running characteristics; poor surface finishes will increase wear.

Roughness measuring units Ra and Rz in accordance to
DIN ISO 4288

  Ra Rz
GLYCODUR® F 0.4 µm/
(16 µin)
3 µm
(120 µin)
GLYCODUR® A 0.8 µm
(32 µin)
6 µm
(240 µin)

Determination of bearing size

Roughness factor c4

This will be taken into account by the roughness factor c4, when designing the bearing.
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Roughness factor GLYCODUR®

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