Flat washer under shakeproof -what does that achieve?

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This just shows that the spring washer used was unsuitable for the specific application tested. It does not mean that spring and shakeproof washers have no place in equipment design!

It does not show that.
 

penberth3

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Just a thought, what if the bolt was left hand thread, would it need a left hand spring or serated washer?

Don't think so. Unless it's something fancy like a Huck washer, the spring tension is having more effect than the ends digging in.
 

thinwater

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Are you going to provide some useful information or just slag everyone off...

Contrary, he did provide much useful information about himself. Read some of his responses to other threads.

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The problem with simple declarative statements and simple responses is that this question is actually quite broad. There are many types of shake proofs, and there are many bolting situations, ranging from a simple trailer frame, to a cylinder head, the through bolts on a cored deck. There can't be one answer. In fact, a flat washer is not a single thing; there are stiff bolting washers and thin fender washers that collapse into cones if brought up to full torque.
 

reeac

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Not a mechanical engineer, just an enthusiastic amiture, I have gone over to using nylock nuts (with a washer). They appear to do a good job but not if there is a lot of heat involved :)
The shake proof washers that I've come across had either internal teeth or external teeth (star washers). I assume that they do different jobs, or are they interchangeable?

Way back in the early 1960s in California I owned a 1957 Ford Fairlane 500 which had the 5.2 litre Thunderbird Special V8. I was surprised to discover that the valve adjusters on this pushrod engine were nyloc style self locking ....quite a rigorous application but they seemed to work and were regarded as quite normal over there.
 
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