In the case of fastener nut connection, the washer is indispensable, so what role can the washer play? Let's follow the fastener nut manufacturers to take a look at this little partner today! 1. In places where bolts often need to be disassembled, in order to save the surface of the connected parts from being scratched, it is generally necessary to place a washer flat on the head of the nut or bolt, so as to prevent the surface of the connected parts from being scratched. 2. In some junctions where the frictional resistance requirements are relatively accurate, for example, high-toughness prestressed steel bolts require flat washers to be placed on the nut ends. In this case, the bolts, nuts, and washers are all provided by the same manufacturer. Certain solutions must be made to the nuts and washers to ensure that the frictional resistance between the nuts and washers remains consistent. 3. When the bolt compressive strength is very high and the allowable compressive stress of the connected parts is very low, in order to reduce the pressure surface compressive stress of the connected parts, it is generally necessary to lift the flat washer. 4. In the bolt connection, the pressure transmission on the pressure surface of the bolt head or the nut gradually increases in a triangular shape. The more the pressure surface, the lower the compressive stress. Therefore, the enhanced flat washer can reduce the compressive stress of the contact area of the connected parts and ensure the high efficiency of the bolt connection. 5. In some places, in order to ensure that the bolt holes in the middle of the two connectors can correspond one-to-one, we should increase the hole diameter to compensate for the hole symmetry error. When the bolt holes exceed the standard, the flat washer needs to be raised. 6. Sometimes, in order to facilitate assembly and adjustment, the bolt holes will be made into shaped holes, which can adjust the installation method of the workpiece within a certain range. When using large holes, it is necessary to use thicker flat washers, and more specific conditions, or even use special washers or several washers.