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A handyman uses washers for a variety of jobs. Washers are typically used with screws and apply force to a wider area than would the screw head alone.
If you are installing boards to a wall, you might use lag bolts, for example. Lag bolts have large threads on a large shank that have lots of holding power. If you were to continue to screw in a lag bolt, you could probably break the surface of the board until the bolt head was virtually flush with the surface of the board. The large threads have a lot of pulling force. By installing a thick washer under the head of the lag bolt, that force is spread out under the diameter of the washer. So the force is distributed to a larger surface area.
Lag bolts aren’t the only application for washers, rather they are used in many different situations. They are used for wood, metal, plastic, etc.
Washers are made of different materials also, including metal, rubber, and plastic and can be used for a variety of purposes. Some have teeth that bite into the surface being driven into, some are lock washers and help the bolt and material to stay together and not allow the bolt or nut to work loose. They can also be used as spacers.
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