Split Washer Placement 9

[wickedmotorhead]

I've seen OE's (and others) put split (lock) washers underneath the head of a bolt or underneath the nut in a mounting configuration. Which one is correct or does it matter? Everywhere I search I get a different answer, I need a educated answer to help make my decision. Thanks.

 

[Tmoose]

http://www.boltscience.com/pages/vibloose.htm

"For example, conventional spring lock washers are no longer specified, because it has been shown that they actually aid self loosening rather than prevent it. There are a multitude of thread locking devices available. "

Also, a nice picture of why simply keeping the nut and bolt from turning can be of little real value.

http://www.boltscience.com/images/boltf6.jpg