It depends on the need.

If you are locking a nut to the base metal it is locking to -
use s star / split / double star / spring etc then the nut or a washer
and a nut. The washer spreads the presser across the nut and allows
it to rotate freely.

If you are trying to lock the nut and the thread then
you are trying to put side pressure on the nut....

Sometimes it is two nuts together with a washer.

Many uses.

Martin

On 6/6/2013 10:03 PM, asdfasdf wrote:
On 6/6/2013 10:51 PM, PrecisionmachinisT wrote:
"asdfasdf" wrote in message
...
When using a nut, lock washer and bolt, should you also use a flat
washer between the object and the lock washer? I have seen it done
a million times that way but it seems the flat washer defeats the
purpose of the lock washer. I assume the lock washer is there
to dig in a bit to the object and the nut to keep it from
loosening. The flat washer seems like it would allow the
lock washer to rotate without digging in to the object.

Anyone know?


http://en.wikipedia.org/wiki/Washer_...ocking_washers





Wikipedia ruins everything. I was expecting a big argument to start.