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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 4152 1/4"-20    $0.21       $13.63    100    $122.00    1000 4153 5/16"-18    $0.36       $21.94    100    $197.00    1000 4154 3/8"-16    $0.54       $33.55    100    $302.00    1000 4155 7/16"-14    $1.04       $38.09    50    $343.00    500 4158 1/2"-13    $1.07       $38.68    50    $348.00    500 4159 5/8"-11    $1.86       $34.42    25    $310.00    250 4160 3/4"-10    $2.84       $44.81    20    $403.00    200 4161 7/8"-9    $6.97       $76.44    15    $688.00    150 4162 1"-8    $10.04       $80.04    10    $720.00    100 Fine thread 10520 1/4"-28    $0.38       $23.09    100    $208.00    1000 10521 5/16"-24    $0.50       $32.08    100    $289.00    1000 10522 3/8"-24    $0.72       $45.06    100    $405.00    1000 10523 7/16"-20    $1.40       $49.72    50    $447.00    500 10524 1/2"-20    $1.45       $50.67    50    $456.00    500 10525 5/8"-18    $3.00       $53.64    25    $483.00    250 10526 3/4"-16    $4.43       $65.02    20    $585.00    200

See also

Metric hex nuts

A standard six sided nut.