Mark and Kim Smith wrote in message
...


DoN. Nichols wrote:

snip

583) Castlelated nut -- used on a bolt or a stud with a cross-drilled
hole and with a cotter pin placed through the hole between the
projections and bent to hold it in position to prevent the nut
from changing position. Commonly used when the proper setting
is not tight enough to prevent the nut from shifting due to
vibration. An example (though this is too small for that task)
is the nut holding the outer bearing on a front wheel assembly
of a car (without front-wheel drive).


Nope, that's where slotted nuts are used. Not Castelated. There is a
difference.

The only difference is that strictly speaking a castellated nut has a
cylindrical section above the hexagonal part (as in the case of 583) and a
slotted nut doesn't. I reckon most mechanics and engineers would
automatically call both types a castellated nut though and be unaware of the
somewhat pedantic difference.

Both types are designed for use with a split pin but the cylindrical part of
a castellated nut makes it easier to wrap the split pin ends round the nut.
Castellated nuts most certainly are used on automotive axles. You tend to
see slotted nuts more on ball joints and other suspension parts. However
probably the most common way of holding an adjustable type wheel bearing is
a plain nut and the split pin goes through a pressed steel nut retainer
which can be rotated to best line up with the split pin hole without
altering the nut setting. The non adjustable wheel bearings tend to be
torqued up to very high settings and a flange at the top of the nut is then
staked into a notch on the axle so no split pin is used.

http://www.vespamaintenance.com/body/rbrake/

There's a pic of what is clearly a castellated nut on the wheel hub of a
Vespa - all I could find online at short notice.
--
Dave Baker