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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 4370 3mm x 0.5mm    $0.05       $2.45    100    $20.50    1000 4802 4mm x 0.7mm    $0.06       $3.19    100    $26.30    1000 4803 5mm x 0.8mm    $0.07       $3.32    100    $27.20    1000 4804 6mm x 1.0mm    $0.08       $3.63    100    $30.10    1000 4805 7mm x 1.0mm    $0.12       $6.95    100    $57.30    1000 4806 8mm x 1.25mm    $0.11       $5.39    100    $44.30    1000 4807 10mm x 1.5mm    $0.19       $9.58    100    $78.50    1000 4808 12mm x 1.75mm    $0.23       $6.49    50    $53.80    500 4809 14mm x 2.0mm    $0.44       $8.05    25    $66.60    250 10692 16mm x 2.0mm    $0.60       $11.03    25    $91.30    250 10693 18mm x 2.5mm    $0.80       $14.84    25    $123.00    250 10694 20mm x 2.5mm    $0.89       $16.05    25    $133.00    250 Fine thread 6889 8mm x 1.0mm    $0.20       $6.51    50    $54.00    500 6890 10mm x 1.25mm    $0.34       $10.71    50    $88.70    500 6892 12mm x 1.5mm    $0.42       $13.56    50    $112.00    500 6894 14mm x 1.5mm    $0.65       $20.96    50    $174.00    500 6895 16mm x 1.5mm    $0.89       $29.61    50    $245.00    500 Super Fine 6891 10mm x 1.0mm    $0.34       $10.71    50    $88.70    500 6893 12mm x 1.25mm    $0.42       $13.56    50    $112.00    500

See also

Hex lock nuts nylon insert

A hex nut with a nylon ring to resist loosening.