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Loctite would not help us much. we use it quite a bit over here but in this situation it is infeasible. Ceramic screws was an idea someone brought up at a meeting, but was never fully looked into. I guess now is a better time than ever. i appreciate the interest. Any further ideas?

I will be using a plastic screw and a rubber washer to mount an electronic board. This board will have to undergo small amounts of vibration that i feel might affect the screw. Any ideas of how to keep the screws from backing out. i may not use any metals! thank you in advance WJM

Does anyone know what the mechanisms are used to keep the lug nuts from backing out from the wheel? This was after a discussion. I thought that it might be the centripetal motion of the wheel that causes a torgue on the nuts that drive it into the car. Someone else said that lug nuts are...

thanks a lot everyone, I'll have to look into the Machinery's Handbook. Anyways, I am doing this for my technicians, I just didn't want to bother them every couple of hours with these kind of questions and wondered whether there was a chart. Once more thanks again WJM

Does anyone know where I may find values for the clearances needed to assemble hex-head fasteners? For instance, if I have a M6 hex head nut that is going in a plastic molded piece, how large should I make the diameter of the cavity so that the technicians may assemble the nut in place?

Thanks everyone, I will look into your suggestions

The bracket and screws should move together. But bracket would receive a jerk randomly when in use. We believe these jerks eventually led to the screws tearing through the aluminum block. Gauging the stresses during these jerks are difficult if possible to find.

I haven't thought of a bigger OD washer, we are currently using a spring lock washer. I was not here when this system was originally designed, but I do not think that the spring lock washer really had much of a purpose? I'll look into replacing it. It is essentially the same idea of making the...

I apologize for my "ate through" language. The problem isn't corrosion either, we took care of that during the design process. Instead, by ate through, i literally mean that the threads in the stainless steel screws tore through the aluminum block. Thank you, WJM

Hey everyone, Where i work im in charge of finding a retrofit for a design flaw. basically, it appears that some bad calculations were made and two M6 Stainless Steel fully threaded bolts ate through a bracket of AL 6061. I also noticed that the through holes were much too large (1/4" dia). I...