Proper use of Flat Washers, Lock Washers Et. Al.
Proper use of Flat Washers, Lock Washers Et. Al.
(OP)
I am working for a company that produces military hardware and I am having a hard time convincing anyone here that the use of a flat washer is necessary when fastening irridited aluminum parts. They insist that only a lock washer is required. I have shown them the result of using no flat.....pitted and chewed parts from the locks. I have searched everywhere to find a document to show them something that supports my position. Also, we stainless hardware from #2 to 1/4' machine screws. Would it not be better to not chew up the irriditing and allow electrolisis to start? If the irridite is not comprimised a better resistance to dissimalr metal corrosion? Most of our stuff is used in salt air and other harsh environments. Any info would be appreciated greatly. Thanks
Rob
WD4DUI@bellsouth.net
Rob
WD4DUI@bellsouth.net





RE: Proper use of Flat Washers, Lock Washers Et. Al.
The Handbook is available at:
http://www.dekker.com
The Manual is available at:
http://
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Try this site http://assist.daps.dla.mil/quicksearch/
It will help you search for the right standard. You might have to purchase the standard but I know for some you dont.
Good Luck
RE: Proper use of Flat Washers, Lock Washers Et. Al.
You may be right in terms of corrosion, but adding a flat washer is wrong and will defeat the action of the lock washer.
Without the flat washer, the lock washer digs into the fastener and the part being fastened. This is how the lock washer "locks".
Now if you add a flat washer to protect the part from damage from the lock washer, the flat washer will be locked to the lock washer but the flat washer won't be locked to the part being fastened. This is bad.
Tom
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Thread108-114051
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Thanks again!
Rob
WD4DUI@Bellsouth.net
RE: Proper use of Flat Washers, Lock Washers Et. Al.
RE: Proper use of Flat Washers, Lock Washers Et. Al.
ht
RE: Proper use of Flat Washers, Lock Washers Et. Al.
page 4. "Spring type washers are not allowed on structural members"
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Toss the helical-split, internal-toothed, and external-toothed lock washers. I've tested these on railroad equipment. Bolted joints without are better than with! The lockwashers make the joints softer and drive the natural frequencies down. Instead use Bellville, wavy-spring, or cupped spring washers!
Best of all, use prevailing-torque locking methods ala nylon patched screws or self-locking nuts with nylon locking element.
If you find a credible reference that did a formal study on lock washers, I WOULD LOVE TO HAVE IT!
Tunalover
RE: Proper use of Flat Washers, Lock Washers Et. Al.
I think you could get some data from the original work done by Junker. Here is a link to an SAE paper that you could have faxed or mailed to you for ~ $10:
http:
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Tunalover
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP3.1 / PDMWorks 05
ctopher's home site
FAQ559-1100
FAQ559-716
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Tony.
RE: Proper use of Flat Washers, Lock Washers Et. Al.
Just good old race track engineering......
"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein
RE: Proper use of Flat Washers, Lock Washers Et. Al.
RE: Proper use of Flat Washers, Lock Washers Et. Al.
They use these on railroads, heavy equipment, machinery too.