概述任何产品的组装,几乎都离不开螺栓螺母这类紧固件。螺拴螺母大都采用电镀层来进行防腐和装饰。电镀层必须达到一定的厚度才具有应用价值。由于电镀层会影响零件尺寸,为了保证零件在电镀后能顺利装配,就必须在零件的配合部位留出合理的镀层余量尺寸并控制尺寸公差。对于一般的机械零 Overview The assembly of any product, almost all inseparable from the type of fasteners such as bolts and nuts. Bolt nuts are mostly used for corrosion protection and decoration plating. Plating layer must reach a certain thickness of the application value. As the plating layer will affect the size of the parts, in order to ensure that the parts can be assembled smoothly after plating, it is necessary to set reasonable size of the plating margin and control the size tolerance in the parts of the parts. For general mechanical zero