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Rolling if used in harsh environments, bearing seals and sealing cover is essential, because they prevent dirt intrusion, extending bearing life. Bearing dust seal with hook bead structure, and has the following advantages over the prior art, good sealing performance, high seal strength. Deep groove ball bearing The reason for its skeleton hook bead seal structure effectively increases the elasticity of the elastic and strength effects compensate dental mouth size to maximize the impact of poor scattered, it can not only rely on the elastic sealing elastomers, as well as crimping structure generated improved capping qualified rate, and machine pressure, can effectively compress. Sealed bearing life to a large extent depends on its sealing performance,which are commonly used for the hem type bearing seals skeleton, it is generally fitted cap by hand pressure, contact angle measurementthe main disadvantage is that elastic strength poor assembly performance poor sealing performance is also poor.