I've seen flat washers that have the same diameter, but vary in thickness.
How does depth affect a washer?
What is the best application for a thin washer? What is the best application for a thick washer?
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Hello, and welcome to Stack Exchange. Might it be as simple as "to space something further away or closer from something else"?– Daniel GriscomDec 30, 2016 at 12:57
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Some washers like fender washers are much thinner they form better to the surface where a washer like the one shown are for strength the bolt head will not easily deform these and possibly pull through a larger hole where a fender washer may deform and not hold as well.– Ed BealDec 30, 2016 at 13:56
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The pictured washer might be most often used to keep a moving part (ie. wheel or blades) from the stationary part to which it is attached. A thinner one, of the same outer dia., might be most often used when a screw is being used in a pre-drilled hole that is almost the same size as the head of the screw or slightly larger; especially if it's being used on a metal object. Fender washers are most often used when the material is relatively fragile (ie. thin metal or peg board). Carriage bolts, securing (ie) 2x8's or 4x's, require a thick washer that's nearly twice the width of the bolt head.– James OlsonDec 30, 2016 at 16:53
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"Carriage bolts, securing (ie) 2x8's or 4x's, require a thick washer that's nearly twice the width of the bolt head." Why so? I cannot imagine that a standard thin washer would deform, since the tension is applied evenly. I've never seen a deformed washer before.– FilDec 31, 2016 at 0:16
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