JavaScript is not enabled. To use the online shopping features of this website, JavaScript must be enabled in your browser. You can still browse our product catalog and place an order over the phone. [more]

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 4120 1/4"-20    $0.10       $6.21    100    $55.40    1000 4121 5/16"-18    $0.12       $7.44    100    $66.50    1000 4122 3/8"-16    $0.18       $11.51    100    $103.00    1000 4123 7/16"-14    $0.36       $22.63    100    $202.00    1000 4124 1/2"-13    $0.41       $26.18    100    $234.00    1000 4125 5/8"-11    $0.87       $54.31    100    $485.00    1000 4126 3/4"-10    $1.24       $79.83    100    $712.00    1000 Fine thread 4127 1/4"-28    $0.12       $6.87    100    $61.40    1000 4128 5/16"-24    $0.18       $10.33    100    $92.30    1000 4129 3/8"-24    $0.23       $14.40    100    $129.00    1000 4130 7/16"-20    $0.46       $27.97    100    $249.00    1000 4131 1/2"-20    $0.64       $36.83    100    $329.00    1000 4132 5/8"-18    $1.14       $70.94    100    $633.00    1000 4133 3/4"-16    $1.58       $112.17    100    $1,001.00    1000

See also

Metric hex jam nuts

A thinner version of a hex nut.