Locking Washers
Locking Washers
(OP)
Does anyone think you should not have locking washers in bolted components subjected to fatigue bending and stresses?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Locking Washers
This subject has been covered before - please perform a search on this site.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Locking Washers
RE: Locking Washers
For high stress connections heat treated flat washers under the bolt head and self locking nut seem to be the best we’ve found.
RE: Locking Washers
RE: Locking Washers
RE: Locking Washers
Please read Thread725-57042, Thread725-63343, and Thread725-85323.
PatCouture,
Helical split washers are worthless for most engineering applications. Please review the referenced threads (especially the one that links to NASA RP 1228).
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Locking Washers
Thanks again.
Patrick
RE: Locking Washers
Are these washers also redundant?
Jeff
RE: Locking Washers
You are describing a horrible joint. In the auto industry, they are not allowed - you have to use a proper nut (weld nut, staked nut, u-nut) so that you have a process-capable joint (high drive/strip ratio) as well as a joint that can withstand service loads. In your scenario the washers aren't necessarily redundant, the whole joint is not good. It is preferrable to design a proper joint and avoid "fastener magic" that usually doesn't work.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Locking Washers
RE: Locking Washers
I appreciate what you say and have argued for years against the use of spring washers in proper joints.
However it is a fact of life that many assemblies are designed and built to a price, often in the face of fierce competition. I am not talking about motor cars, but toasters, washing machines, computers, furniture.
Everything in life is a compromise; strength, weight, cost etc., and sometimes the market won't pay for anything better. I think there can be a valid case for specifying a shakeproof washer.
Jeff
RE: Locking Washers