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Pre-staked nuts

showcrop

showcrop

Well-known Member
I am working on something that I have to be absolutely sure doesn't come apart, and it is subject to abuse. as I was reassembling I was putting blue Lock Tite on the bolts and then I noticed that the nuts are pre-staked. They make the nuts just slightly out of round but I can't see any damage to the threads of the bolts that they came off from. One was Ny-Lock and I am planning to get some more of those. Question is: are these pre staked nuts supposed to be reusable?
 
I have in a pinch took a regular nut and hit it with a 2 lb maul and made a locknut. I have reused the nuts like you are talking about.
 
There are some nuts that have a small flat inpression on them.I know that nuts on steering and pinions are supposed to be replaced with new if taken off.
 
In the aerospace industry, those are called "deformed thread locking nuts", and yes, they can be re-used. Don't recall how many times, but as long as they don't become round (and therefore not deformed) they should be okay.

They work very well in high vibration environments.
 
They are called "stover" nuts. Used to work on trenchers, we used lots of them !! They are as Ken said, a one use item. I also have reused them in a pinch. I still use them, I seldom buy Nylocs.
 

There are various styles of locking nuts. The stover styles, flexloc nuts and nylon-insert locknuts are many times listed as reuseable. Another type referred to as centerlock are typically listed as not reuseable. Any good industrial supply company such as McMaster-Carr will carry the various types.

Either way, reuseable or not, you should always check the running torque during installation of any locking type nut. The running torque is the the torque required to turn the nut when it is has full thread engagement but before it begins to clamp against the mating part.

If you do not want the nuts to loosen the most important procedure is to torque the bolts at installation. If torque specifications are available for the machine use those, other wise use the standard value for the grade of bolt and thread type. Proper torque is also good (the best) insurance to prevent bolt breakage and the nuts from backing off.
 
As a young lad, in Army Aviation, we were told
to NEVER reuse a nut..And, Most of them were
saftey wired, also !
 
If I want to be sure the nut stays on, I use a sharp centre punch to
damage a few threads where they protrude past the nut. One good
punch mark is all it takes and the nut will still screw off for
disassembly.
Cheap way to do it if you are reusing the nuts!
Sam
 
Stover style nuts are not reusable (reliably). This also goes for the bolt they were used on. One style of nut you may want to look into is an ANCO nut. They have a hardened steel stud embedded into the side of the nut that prevents the nut from backing off. One time use here as well, though.
 
On any crtical joint I would always use new fasteners.
Ny-locs are not good where it gets hot, and with some of the cheaper ones I have seen the nylon crack when assembled if it was real cold.
Stovers are "side crimped" through larger rollers.
Top locks are hit front the top with three punches to deform the last bit of the threads.
I re-use them all the time, sometimes you need to give them a smack with a hammer.
Safety wire keeps you from loosing fasteners in my experience.
A lot of the new fasteners are torque to yield. i.e. you are puttiing stretch into the bolt. Some you can re-use one to five times. Me, I would replace them regardless.

If you trully want it not to come apart, weld it after you put it together.

Rick
 
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