SKF
Product Size (Mounted)
Sizing the mounted unit uses the dynamic load rating of the bearing insert and the static strength of the housing. SKF’s calculated L10mh life must equal or exceed the required service life, and the housing’s permissible static load must not be exceeded. The size is selected from the catalogue based on shaft diameter and load requirements, often with an iterative check for different housing materials and bearing series.
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Dynamic Load Rating Check
SKF rating life L10mh meets or exceeds required machine service life.
Static Safety Factor Verification
Housing and bearing insert withstand peak static loads without deformation.
Shaft Diameter Optimisation
Selects the smallest possible bore for cost and space efficiency.
Housing Strength Validation
Cast iron, ductile iron, or composite ratings matched to calculated maximum loads.
Thermal Expansion Compensation
Clearance class chosen to maintain safe internal play at operating temperature.
Catalog‑Based Quick‑Sizing
Standardised selection tables simplify preliminary size choice.
Using SKF’s Dynamic Load Rating for Unit Bearings
The dynamic load rating C of the bearing insert is used just like a rolling bearing, but the housing contributes load‑sharing and stress. SKF provides modified rating factors for mounted units that account for housing stiffness and bolt‑load distribution, ensuring the calculated life is realistic.
When to Move from Cast Iron to Ductile Iron Housings
When the static safety factor drops below 2, or when shock loads are frequent, a switch from grey cast iron to spheroidal graphite (ductile) iron or cast steel is mandatory. SKF’s housing‑strength charts immediately flag these design limits, protecting the bearing from catastrophic housing fracture.