Generally, we use fasteners in the process often use some gaskets, gasket in the end it can bring us what role? To increase the contact area. General Fasteners and objects in contact area is relatively small, then the force will be a corresponding effect is relatively small, more easy to loose, in order to enable a more solid locking fasteners objects will be used to increase the love of fasteners gasket and the contact area of ??the connection object. Fasteners to prevent the demolition process can use spring pad to the object causing damage. In the use of the process, we can let the flat pad and objects close together, and then use spring pad outside, so it can prevent the damage caused by the spring pad to the object, but also can play a spring cushion effect, and also able to let the force area more balanced. When used in this way can also be connected to the spring pad to prevent damage to the object. Can help us to increase the friction. We all know that the use of high-strength bolts of the process, is relying on friction to fixed, sometimes we order to be able to make high-strength bolts and increased friction between objects. We will choose to use shims to solve this problem, after testing, we found that the use of high-strength bolts gasket can greatly improve friction. In some special cases can be used. For example, when we want to lock the nut that place just is not threaded, then we can use gaskets, fasteners there is too long when we, like appearance that, then are based gaskets, we can let fasteners look more beautiful.