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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 7210 #2-56    $0.06       $3.27    100    $28.10    1000 2536 #4-40    $0.07       $3.81    100    $32.70    1000 2537 #6-32    $0.08       $4.50    100    $38.80    1000 2538 #8-32    $0.09       $5.95    100    $51.10    1000 2539 #10-24    $0.11       $6.69    100    $57.50    1000 2540 * #10-32    $0.11       $6.69    100    $57.50    1000 2541 #12-24    $0.23       $14.16    100    $122.00    1000 Fine thread 2540 #10-32    $0.11       $6.69    100    $57.50    1000

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