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Nut size (A.K.A. diameter) is the size bolt that the nut is used with. The same is true of the thread count. Thus a 1/4"-20 nut fits a 1/4"-20 bolt.
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$3.15 / 100
$26.60 / 1000
$3.88 / 100
$33.00 / 1000
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USS pattern is the most common type of flat washer.
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.
A nut with a built in washer which is serrated to resist loosening.