What does a center lock nut look like?
Center lock nuts are low cost, one piece, all-metal prevailing torque hex lock nuts with chamfered (beveled) corners. The locking action is created by two or three equally spaced rectangular or round indentations centered in the flats (sides) of the nuts that slightly distort the threads.
How often should a center lock nut be used?
As a standard practice—to ensure full thread engagement with the nut—bolts/screws should be long enough to allow at least two full threads to extend beyond the nut face after tightening. Center lock nuts are reusable for a limited number of times because the prevailing torque declines each time the nut is used.
What makes a McMaster centerlock nut so good?
For technical drawings and 3-D models, click on a part number. These locknuts have good chemical resistance and may be mildly magnetic. They have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.
Why are center lock nuts called prevailing torque?
Consequently, unlike free spinning lock nuts, there is a resistance to rotation during both assembly and disassembly requiring them to be wrenched; that resistance is called prevailing torque. The advantage is that self disassembly is unlikely even if preload diminishes completely because of the remaining rotational resistance.
Center lock nuts are low cost, one piece, all-metal prevailing torque hex lock nuts with chamfered (beveled) corners. The locking action is created by two or three equally spaced rectangular or round indentations centered in the flats (sides) of the nuts that slightly distort the threads.
As a standard practice—to ensure full thread engagement with the nut—bolts/screws should be long enough to allow at least two full threads to extend beyond the nut face after tightening. Center lock nuts are reusable for a limited number of times because the prevailing torque declines each time the nut is used.
For technical drawings and 3-D models, click on a part number. These locknuts have good chemical resistance and may be mildly magnetic. They have an irregularly shaped thread in the middle of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.
Why do lock nuts need to be all metal?
This saves on screw length, because threads need not protrude from the nut to lock securely. Since they are all-metal, they are more resistant to higher temperatures and chemical exposure than non-metallic lock nuts (such as nylon insert lock nuts).