Comes in bags of 250 each, 500 each and cases of 1,000 each or 2,000 each.
A flange nut is a nut that has a wide flange at one end
that acts as an integrated, non-spinning washer. This serves to
distribute the pressure of the nut over the part being secured, reducing
the chance of damage to the part and making it less likely to loosen as
a result of an uneven fastening surface.
The flange may be serrated to provide a locking action.
The serrations are angled such that they keep the nut from rotating in
the direction that would loosen the nut.
Because of the serrations they cannot be used with a
washer or on surfaces that cannot be scratched. The serrations help in
avoiding vibration of nut and increase the holding power of nut.