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Dust
shield is often installed to retain lubricant and to prevent
contamination from entering the bearing raceways. The most common
type of shield is the Z-shield. Z-shield is non-removable,
being permanently staked to the bearing outer race with a small
gap of approximately .005 inches between the inside diameter of
the shield and the bearing inner ring. Since there is no contact
with the inner ring, the torque and speed limitations are virtually
unaffected and the performance of the bearing is almost identical
to that of an open bearing. Standard material is 300 series stainless
steel.
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