Center Lock Nut Theory

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dibbons

dibbons

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It's pretty much what I was guessing.
Center Lock Nuts - Fastener Mart

center lock nuts.jpeg
 
Umm ok. Factory mopar U bolts used these or something along these lines, along with a bunch of other manufacturers.
 
67Dart273 said:
Your point is what?
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His point is to get us to ask him what his point was.

Yeah, it’s a specialty nut. It has specific applications where it works well and certain applications where its use is not advisable. You know, like every other fastener and part out there.
 
I thought I was completely missing something. Jeep Cherokee's use those on their motor mount bolts
 
72bluNblu said:
His point is to get us to ask him what his point was.

Yeah, it’s a specialty nut. It has specific applications where it works well and certain applications where its use is not advisable. You know, like every other fastener and part out there.
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Seems passive aggressive. I recently learned what passive aggressiveness is and I wish I had not learned what it is because now, a lot of people piss me off.
 
dibbons said:
It's pretty much what I was guessing.
Center Lock Nuts - Fastener Mart

View attachment 1715557615
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Those are stakes that slightly deform the threads inside the nut.... This creates drag so the nut won't vibrate loose, it won't 'rattle' off the bolt/stud...

Specifically they are called prevailing torque nuts... They are made in many different configurations... Some are staked on the side like the one that you show, some are staked on the top of the nut near the hole, and some use nylon inserts on the top of the nut to create drag on the shaft of the bolt and keep it from vibrating loose...
 
inertia said:
Con Rod nuts.
Motor mount to engine bolt/nuts
Wheel/lug nuts
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How do you do a con rod with these?
"Do not apply standard torque values to prevailing torque lock nuts because the joint may not be tightened to the correct clamping force due to the additional friction of the locking element"
 
pishta said:
How do you do a con rod with these?
"Do not apply standard torque values to prevailing torque lock nuts because the joint may not be tightened to the correct clamping force due to the additional friction of the locking element"
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Yes, do not use standard torque specs for prevailing torque nuts...

You have to develop a torque specifically for those parts through torque testing...
 
krazykuda said:
Yes, do not use standard torque specs for prevailing torque nuts...

You have to develop a torque specifically for those parts through torque testing...
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Anyone know of a con rod app for these? Wonder what the FSM says for those torque specs. Makes sense to use something like this in all kinds of apps. I'm thinking fool proof axle nuts for Walmart bicycles.
 
and sometimes they really suck in tight spaces when you can't get a socket or wrench on one, because they can be a ***** to spin on with your fingers
 
I have NEVER seen those used on wheels, OR con rods.
 
pishta said:
Anyone know of a con rod app for these? Wonder what the FSM says for those torque specs. Makes sense to use something like this in all kinds of apps. I'm thinking fool proof axle nuts for Walmart bicycles.
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No conn rod apps come to mind... But I've seen them on rear axle u-bolt nuts....
 
It's a Center-Locking Distorted Thread Lock Nut ( or reversible locknut ) and they are NOT REUSABLE.
If you take them off you are supposed to replace them.

Supposedly they grip a little better than a nylon insert locknuts... But they are more than likely to cause damage to the external threads they are go onto. But then again, I've had poorly made nylock's strip threads.
 
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