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Plastic cover and the metal cover is that we will encounter more often, and then the bearings plastic cover and metal cover what difference do it? What benefits do they have?

The main purpose, what is it? Do not worry, here we have for you simply to introduce.

Bearing the use of plastic cover mainly dust. But also waterproof seal Yan; But friction is large and low speed than the metal cover, so heat dissipation

The difference can be compared with Lid; plastic cover is also divided into contact and non-contact, but the specific almost, that is a little tightness and friction on the difference.

And Lid uses more roles is mainly dust. Tiegai higher speed, but because of iron, it is not waterproof.