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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 - Left hand 13555 1 1/4"-20    $0.41       $13.81    50    $127.00    500 13556 1 5/16"-18    $0.52       $17.67    50    $162.00    500 13557 1 3/8"-16    $0.84       $28.05    50    $257.00    500 13558 14 1/2"-13    $2.05       $34.56    25    $317.00    250 13559 14 5/8"-11    $10.76       $36.26    5    $333.00    50 13560 14 3/4"-10    $21.46       $72.26    5    $663.00    50 Fine thread - Left hand 13561 1 1/4"-28    $0.48       $16.94    50    $156.00    500 13562 1 5/16"-24    $0.69       $23.83    50    $219.00    500 13563 1 3/8"-24    $1.00       $33.98    50    $312.00    500 13564 14 1/2"-20    $2.54       $43.17    25    $396.00    250 13565 14 5/8"-18    $13.31       $45.29    5    $416.00    50 13566 14 3/4"-16    $26.55       $90.28    5    $829.00    50

1 This item is not always in stock and may take up to 5 business days to ship.

4 This item is a semi-standard size and is therefore more expensive.

See also

Metric hex jam nuts

A thinner version of a hex nut.