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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 15015 6mm x 1.0mm    $0.11       $6.35    100    $56.80    1000 15016 8mm x 1.25mm    $0.14       $8.99    100    $80.70    1000 15017 10mm x 1.5mm    $0.24       $15.75    100    $142.00    1000 15018 12mm x 1.75mm    $0.31       $9.90    50    $89.30    500 15019 14mm x 2.0mm    $0.68       $10.05    25    $90.60    250 15020 16mm x 2.0mm    $1.05       $15.38    25    $139.00    250

See also

Hex lock nuts nylon insert

A hex nut with a nylon ring to resist loosening.