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 2648 1/4"-20    $0.05       $1.49    100    $12.00    1000 2649 5/16"-18    $0.05       $1.95    100    $17.00    1000 2650 3/8"-16    $0.05       $2.98    100    $24.90    1000 2651 7/16"-14    $0.09       $3.26    50    $27.00    500 2652 1/2"-13    $0.10       $3.37    50    $29.80    500 7602 9/16"-12    $0.20       $8.16    50    $68.00    500 2653 5/8"-11    $0.19       $3.53    25    $29.40    250 2654 3/4"-10    $0.35       $4.82    20    $40.90    200 2655 7/8"-9    $0.71       $8.54    15    $74.90    150 2656 1"-8    $1.03       $9.00    10    $79.10    100 2657 1-1/8"-7    $1.81       $15.32    10    $135.00    100 2658 1-1/4"-7    $2.72       $23.11    10    $203.00    100 9191 1-3/8"-6    $4.46       $38.89    10    $341.00    100 2659 1-1/2"-6    $5.67       $26.53    5    $233.00    50 Fine thread 7603 1/4"-28    $0.05       $2.62    100    $23.00    1000 7604 5/16"-24    $0.05       $3.26    100    $28.80    1000 7605 3/8"-24    $0.07       $4.49    100    $39.60    1000 7606 7/16"-20    $0.14       $5.20    50    $45.70    500 7607 1/2"-20    $0.15       $5.31    50    $46.70    500 7608 9/16"-18    $0.24       $9.35    50    $81.90    500 7609 5/8"-18    $0.34       $7.56    25    $66.30    250 7610 3/4"-16    $0.49       $8.96    20    $78.50    200 9185 7/8"-14    $0.98       $11.29    15    $99.50    150 9186 ^ 1"-14    $1.32       $11.44    10    $100.00    100 9187 1-1/8"-12    $1.89       $16.87    10    $148.00    100 9188 1-1/4"-12    $2.50       $22.45    10    $197.00    100 9189 1-3/8"-12    $4.62       $41.37    10    $363.00    100 9190 1-1/2"-12    $6.09       $54.33    10    $477.00    100

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

See also

Metric hex nuts

A standard six sided nut.