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A: Countersunk head rivets are widely used in automobiles, vehicles, mechanical and electrical products,building decoration and household appliances. It is suitable for the occasion which the screws screwing in, the strength requirements are not high and the thread diameter is less than 10mm. When it rivets, all or part of head will sink into the connection. This riveting structure is mainly used for the occasion that the surface of connection is smooth, such as the instrument surface.