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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 2675 1/4"-20    $0.05       $2.99    100    $25.60    1000 2676 5/16"-18    $0.07       $3.95    100    $34.00    1000 2677 3/8"-16    $0.11       $5.89    100    $50.20    1000 2678 7/16"-14    $0.14       $4.73    50    $40.50    500 2679 1/2"-13    $0.18       $6.75    50    $57.70    500 2680 9/16"-12    $0.33       $6.20    25    $53.20    250 2681 5/8"-11    $0.36       $6.89    25    $58.90    250 2682 3/4"-10    $0.47       $7.73    20    $66.40    200 2683 7/8"-9    $1.61       $20.49    15    $175.00    150 2684 1"-8    $1.90       $16.28    10    $139.00    100 Fine thread 7180 1/4"-28    $0.05       $4.00    100    $34.20    1000 7181 5/16"-24    $0.09       $5.60    100    $48.00    1000 7182 3/8"-24    $0.13       $7.48    100    $64.20    1000 7183 7/16"-20    $0.18       $6.70    50    $57.40    500 7184 1/2"-20    $0.22       $8.10    50    $69.50    500 7185 9/16"-18    $0.37       $6.64    25    $56.90    250 7186 5/8"-18    $0.44       $8.39    25    $71.90    250 7187 3/4"-16    $0.62       $11.34    20    $97.00    200 7188 7/8"-14    $2.14       $23.87    15    $204.00    150 7189 ^ 1"-14    $2.47       $18.94    10    $163.00    100

^ 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.