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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 9194 #2-56    $0.05       $1.85    100    $15.00    1000 2642 #4-40    $0.05       $1.25    100    $9.90    1000 9195 #5-40    $0.05       $2.90    100    $23.70    1000 2643 #6-32    $0.05       $1.40    100    $11.20    1000 2644 #8-32    $0.05       $1.53    100    $12.20    1000 2645 #10-24    $0.05       $1.69    100    $12.80    1000 2646 * #10-32    $0.05       $1.69    100    $12.80    1000 2647 #12-24    $0.05       $2.47    100    $20.10    1000 Fine thread 2646 #10-32    $0.05       $1.69    100    $12.80    1000

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