Flat washers are usually thin pieces of various shapes , used to reduce friction , prevent leakage , isolate , prevent loosening or distributed pressure . Many materials and structures have this component , for the performance of various types of similar effect. Threaded fasteners due to limitations and process materials , bolts and other fasteners so that the bearing surface is not, therefore to reduce the compressive stress bearing surface protect the surface of the connecting member , the use of epdm gasket. To prevent loosening connection with anti- vice loose multi- toothed spring washer and lock washer , round nut and saddle washers , wave , conical spring washers .

Generally flat washer mainly used to reduce the pressure , when some parts of the tightening axial force is large , easy to make pressed into a dish washer , then can use materials and improve the hardness to solve.