Definitions for "Jam Nut"
A second nut tightened against a primary nut to prevent it from working loose; used on inner and outer tie-rod adjustment nuts and on may pinion-bearing adjustment nuts.
Hex nut used to fix the height position of a threaded leveling foot or caster in the next
1] A second nut on a screw or bolt which locks against the first nut (i.e., jams against it) so that the nut won't come loose. [2] A self-locking nut