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Difference between bearing with dust cover and bearing with sealing ring

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The bearing has a dust cover and a sealing ring; the two functions are different; one is dustproof; the other is sealed. Dustproof is to prevent dust from entering the inside of the motor, the sealing is not only the external dust can not enter and the internal grease is not easy to flow out. Clean grease is also not easy to flow in. In practice, the two are different; not too big. Bearings usually have oil caps on the watch; this effect is now available; as long as it is required under certain conditions. The seal is indicated by S; (the felt seal is indicated by FS, the rubber seal is indicated by LS). You make up for the difference between the two; the bearing manufacturer with dust cover (including seal) has grease added inside; It is necessary to add grease when installing without dust cover.

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