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When included, the garter spring applies pressure to the sealing lip against the shaft, ensuring a tight seal. The choice of material, like that of the case, largely depends on the environment of use.
Oil seals are called rotary shaft seal or radial lip also.

When repairing, remove the old oil seal
4) Allowable total eccentricity
Generally, an oil seal is made up of an outer circular metal part and a bonded inner flexible material (often nitrile rubber) that does the actual sealing.
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