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Lock washer Question
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Posted by: GreenEngineer

06/22/2004, 21:59:52

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Question:
Does every fastener assembly need to use lock washer with fastener (screws)? Can one just use flat washer?

Thanks.

Green Engineer







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Re: Lock washer
Re: Lock washer -- GreenEngineer Post Reply Top of thread Forum
Posted by: Cragyon
Bart
06/23/2004, 10:30:51

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Not every fastener installation requires a locking washer or simular device to prevent the fastener from backing out.  For low cyclic loading or non-critical installations, torquing the fastener properly will do the job.  Where high cyclic or thermal loading will be present, then a locking device should be included within the design and installation.






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Re: Lock washer Smile
Re: Re: Lock washer -- Cragyon Post Reply Top of thread Forum
Posted by: GreenEngineer

06/23/2004, 11:52:49

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Thank you!






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Locking device
Re: Re: Lock washer -- GreenEngineer Post Reply Top of thread Forum
Posted by: RandyKimball
Barney
06/24/2004, 19:05:59

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I have become aware of a new screw thread version out. The outer diameter of the male thread is split a few thousands deep and the (I think) edge away from the head has been flared a few degrees. The effect is the thread does not tend to back out with loaded vibrations. ... (I think) ... Anyone have more data on this?? I can't come up with my source and feel as if I hanging out there a bit. Sounds like a good thing though.

-randy-




The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.


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Re: Locking device
Re: Locking device -- RandyKimball Post Reply Top of thread Forum
Posted by: MacLeod

02/22/2005, 16:56:57

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The threads you describe are produced by Thredlock Taps from Balax, Inc. I first saw a reference to them in the May 6, 2004 edition of Machine Design .

We've been investigating the possible application to our designs. What we found so far is that the resistance to unthreading is very sensitive to the size of the pre-tapped hole. The difference between functional and non-functional can be as little as .003 in. If your drilling process capability can handle this sensitivity, it's a really cool design option.






Modified by Administrator at Tue, Feb 22, 2005, 19:42:33

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