SKF
Properties (Spherical Plain Bearings)
The properties section covers the mechanical and physical characteristics of the different sliding material combinations: load capacity (static and dynamic), permissible pV value, coefficient of friction, wear rate, temperature range, and chemical resistance. For example, steel-on-steel bearings offer the highest load capacity but require lubrication, while steel-on-PTFE fabric provides low friction and zero maintenance within a defined temperature and load range. Understanding these properties enables the engineer to match the bearing to the specific demands of the application — whether it is high-frequency oscillation in a packaging machine, high static load in a bridge bearing, or corrosive exposure in a marine environment.
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Static Load Rating C₀
Maximum load before permanent deformation of the sliding surfaces.
Dynamic Load Rating C
Load at which the bearing reaches a defined sliding distance.
pV Limit
Product of contact pressure and sliding velocity — dictates thermal stability.
Coefficient of Friction µ
Varies from 0.03 (PTFE) to 0.25 (steel/steel unlubricated).
Temperature Range
From cryogenic for composite to +280°C for steel/steel with heat treatment.
Wear Rate
mm of liner thickness loss per km of sliding distance, depending on material.
How pV Difference Between Steel/Steel and PTFE Fabric Changes the Design
Steel‑on‑steel bearings require generous sizing to keep pV low and must be greased. PTFE‑lined bearings accept higher pV and run dry, allowing a smaller, lighter bearing for the same load. The properties table lets the engineer make this trade‑off quantitatively, optimising the linkage weight and cost.
Corrosion Resistance Across Material Combinations
In marine environments, steel‑on‑steel bearings must be stainless with a corrosion‑resistant coating, while PTFE‑composite bearings are inherently inert. SKF’s properties charts indicate the galvanic compatibility and environmental limits of each combination, guiding safe selection for offshore, coastal, and chemical plant applications.