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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 9193 #4-40    $0.05       $1.74    100    $13.90    1000 2620 #6-32    $0.05       $1.78    100    $14.50    1000 2621 #8-32    $0.05       $1.87    100    $15.50    1000 2622 #10-24    $0.05       $1.95    100    $16.50    1000 2623 * #10-32    $0.05       $2.05    100    $17.40    1000 2624 1/4"-20    $0.05       $2.19    100    $18.80    1000 2625 5/16"-18    $0.06       $3.10    100    $26.60    1000 7242 3/8"-16    $0.08       $3.98    100    $33.80    1000 2626 7/16"-14    $0.09       $3.62    50    $30.70    500 2627 1/2"-13    $0.14       $4.80    50    $39.90    500 2635 9/16"-12    $0.28       $5.46    25    $49.20    250 2628 5/8"-11    $0.29       $5.73    25    $51.50    250 2629 3/4"-10    $0.37       $6.24    20    $56.00    200 2630 7/8"-9    $2.43       $20.94    15    $187.00    150 2631 1"-8    $3.06       $24.27    10    $216.00    100 Fine thread 2623 #10-32    $0.05       $2.05    100    $17.40    1000 2632 1/4"-28    $0.06       $3.28    100    $29.40    1000 2633 5/16"-24    $0.07       $4.00    100    $35.90    1000 2634 3/8"-24    $0.08       $5.78    100    $51.40    1000 2636 7/16"-20    $0.12       $4.18    50    $37.50    500 2637 1/2"-20    $0.16       $6.62    50    $59.10    500 2638 9/16"-18    $0.42       $7.18    25    $64.10    250 2639 5/8"-18    $0.60       $10.20    25    $90.90    250 2640 3/4"-16    $0.79       $13.42    20    $120.00    200 2641 7/8"-14    $2.71       $23.33    15    $208.00    150 9192 ^ 1"-14    $3.28       $25.97    15    $232.00    150

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

^ NOTE: While 12tpi is the fine thread (UNF) standard, 14tpi is far more common in actual use.

See also

Metric hex lock nuts nylon insert

A hex nut with a nylon ring to resist loosening.