Machine Design
The function of a washer is to

Provide bearing area
Provide cushioning effect
Absorb shocks and vibrations
Provide smooth surface in place of rough surface

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being greater than unity
Both radial and axial loads and the ratio of these being less than unity
Radial load only
Axial load only

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