Nut Backoff Question
Nut Backoff Question
(OP)
I'm looking for any information about nut backoff. More specifically, the probability that nut backoff will occur when using 1 nut vs. 2 nuts. Also, I'd like to know if there is any documentation (codes, standards, papers, etc) that would provide some information. And finally, does the material of the bolt have any effect on nut backoff. Any thoughts or comments are much appreciated.
Cheers,
Kat
Cheers,
Kat





RE: Nut Backoff Question
How are the two nuts attached? Stacked upon each other mated to a single screw?
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Nut Backoff Question
Castellations and cotter pins do.
Mike Halloran
Pembroke Pines, FL, USA
RE: Nut Backoff Question
RE: Nut Backoff Question
The best thing to do is to search journal articles, SAE technical papers, and ASTM STP's.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Nut Backoff Question
RE: Nut Backoff Question
Thanks Cory, I found a few papers that were very helpful.
Cheers,
Kat
RE: Nut Backoff Question
on "jam nuts". The question sounds
familiar.
RE: Nut Backoff Question
Discusses them. There is a link to download it somewhere on Eng-Tips.
RE: Nut Backoff Question
http:
RE: Nut Backoff Question
Every now and then a lawyer comes trolling around looking for help on developing his case and I for one don't like helping them.
Returning to our original program:
If I recall correctly there was a VDI study a few years ago in Germany that dealt with double nutting. I am not sure which university was involved. I am not aware of any code documentation...I don't think that the Bolting Technology Council has looked at this area at all.
RE: Nut Backoff Question
RE: Nut Backoff Question
In wood connections the bolt design strength is based on tight or loose nuts. When I am concerned about the nuts working loose or being helped off, I call for the threads to be damage after installation.