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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.
For additional dimensional information click on an individual product number or see our US Nut Size Table.

Product # Diameter and Thread count Buy Each Buy Box Box Qty Buy Bulk Bulk Qty Coarse (standard) thread 11783 #6-32    $0.29       $17.73    100    $163.00    1000 11784 #8-32    $0.30       $18.13    100    $166.00    1000 11785 #10-24    $0.32       $19.68    100    $181.00    1000 11786 * #10-32    $0.32       $19.68    100    $181.00    1000 11787 1/4"-20    $0.41       $26.94    100    $242.00    1000 11788 5/16"-18    $0.59       $38.67    100    $347.00    1000 11789 3/8"-16    $0.98       $64.15    100    $577.00    1000 11790 1/2"-13    $1.45       $97.74    100    $880.00    1000 Fine thread 11786 #10-32    $0.32       $19.68    100    $181.00    1000

* 10-32 is a fine thread, but it is listed under coarse thread because it is very common.

See also

Metric hex lock nuts nylon insert

A hex nut with a nylon ring to resist loosening.