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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 11944 #1-64    $0.07       $4.15    100    $37.10    1000 5577 #2-56    $0.05       $2.07    100    $18.20    1000 11911 #3-48    $0.05       $2.14    100    $19.10    1000 4115 #4-40    $0.05       $2.17    100    $19.00    1000 2558 #6-32    $0.05       $2.48    100    $21.90    1000 2559 #8-32    $0.05       $2.79    100    $24.60    1000 2560 #10-24    $0.06       $3.10    100    $27.90    1000 2561 * #10-32    $0.06       $3.10    100    $27.90    1000 2562 #12-24    $0.09       $5.61    100    $50.00    1000 Fine thread 5575 #0-80    $0.07       $4.15    100    $37.10    1000 5576 #1-72    $0.07       $4.15    100    $37.10    1000 2561 #10-32    $0.06       $3.10    100    $27.90    1000

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