Flat Washers with a Larger Outside Diameter - Metric Sizes
Fender Washers are used to prevent pull-though and provide a greater weight bearing surface under the fastener. This prevents nuts, bolts or screws from pulling through base material. Metric fender Washers are distinguished from standard flat washers by their significantly larger outside Diameter (or OD), which creates a larger surface area on the fastener assembly, allowing it to withstand more force. Fender Washers are commonly used to distribute load force on sheet metal, and gain their name from the use on car fenders. Due to their large size they are also used to allow fasteners to connect where rust or damage has made the hole bigger.
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Trade Names: Penny Washer, Repair Washer
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