Split Lock

Is OK to use a lock washer togheter a flat washer in a joint?

I do not think that is OK, but my coworkers do. Can somebody give a link to a convincing website or give a convincing answer. My believe is that when you do that the bottom side of the lock washer is going to slide over the flat washer and the bolt will get loose

Most installations that use lock washers require that a flat washer be used under the lock washer. If you are working with soft material such as wood,plastic or aluminum the lock washer would just in-bed in the material without a flat washer.If you are torquing bolts in a metal to metal application the lock washer is usually not used.
How about lock washers? This is an interesting area. I always thought a lock washer was an important component in insuring that the nut and bolt stay in place. Not true! We keep coming back to the fact that a properly tightened nut and bolt will do much more than any lock washer can ever do. This is because a torqued bolt will stretch slightly and will try to return to its original position. While this is happening the male threads are firmly secured against the female threads of the nut holding it in place. This is why the correct torque setting will maximize holding power. A randomly tightened nut will not reach this holding power. So where does the lock washer fit in? Not very significantly! The standard split lock washer is about the least effective. If it makes you feel better to put it on go ahead but better use a nylon stop nut to hold the bolt in place. Think of how little effort it takes to un-tighten most nuts with a split lock washer. Neither the spring washer nor the wave washer do anything either. The star washer has some holding power on softer metals and plastic but that is about all. The protruding edges can dig in a little and help (but use a nylon stop not to be sure). This might help on the body and fender components. Then there is the tab washer. On an MGA they are used on the rear lugs to hold the drum brakes in place before wire wheels are installed. Tab washers are not very well rated due to the fatigue that takes place when bending the tabs over the nut. NEVER USE A TAB WASHWER A SECOND TIME.

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LITTLE GIANT 921103 Split Ring Lock Washer 1 4 In G2902999
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