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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 pitch. Thus a 6mm x 1.0 nut fits a 6mm x 1.0 bolt.
For additional dimensional information click on an individual product number or see our Metric Nut Size Table.

Product # Diameter and Thread pitch Buy Each Buy Box Box Qty Buy Bulk Bulk Qty Coarse (standard) thread 4792 3mm x 0.5mm    $0.06       $3.19    100    $27.40    1000 4793 4mm x 0.7mm    $0.07       $3.60    100    $30.90    1000 4794 5mm x 0.8mm    $0.07       $4.19    100    $35.90    1000 4795 6mm x 1.0mm    $0.08       $4.95    100    $42.40    1000 4797 8mm x 1.25mm    $0.16       $9.95    100    $85.20    1000 4798 10mm x 1.5mm    $0.30       $19.90    100    $171.00    1000 4799 12mm x 1.75mm    $0.42       $16.75    50    $144.00    500 4800 14mm x 2.0mm    $0.70       $13.84    25    $119.00    250 7361 16mm x 2.0mm    $0.91       $17.60    25    $151.00    250

See also

Hex lock nuts nylon insert

A hex nut with a nylon ring to resist loosening.