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The Deep groove ball bearing usually have 3 types:

The first type is open type, there is no sealing cover and it is mostly used in gearboxes;

The second one is the Steel seal. This one with a cover can be dust-proof, has low friction and fast heat dissipation, so it is very suitable for use in automatic machinery;

The third type, Rubber seal, this one the waterproof and dust-proof performance is better than the Steel seal, which is suitable for use in relatively harsh working environment. like woodworking machinery.

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