Two of the most recognized washers are flat and spring washers. Occasionally, metal washers are also used as spacers to increase the distance between the parts being fastened. These components are made of a soft material, such as plastic or urethane. For example, vibration-isolating washers are designed to absorb vibrations. Several different types of washers are available to suit different applications. Additionally, driving a screw into wood might cause the wood to crack around the surface and a washer helps to reduce this from happening. This prevents the bolt head and nut from scratching or indenting the surfaces of the two fastened parts, which could ultimately loosen the fastener. Before a threaded fastener (such as a screw) is driven into a surface, a washer may be placed through the end for greater protection. Flat washers are used to protect surfaces by evenly distributing torque when a bolt or screw is tightened.Ī washer is a thin plate with a concentric hole that’s typically used to evenly distribute the load of a threaded fastener.
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