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Thermal cycling is not mentioned on the wikipedia site but I thought that
thermal cycling may have been the reason that Belleville washers were used on the link hardware of aircraft Nickel Cadmium batteries.

To clarify, Belleville washers are spring washers, much better than split ring if your intent is to provide a spring pressure that allows some movement and change in length. Much stiffer than a spring and less likely to bounce and break contact than a battery spring.

I think the guidelines for Belleville washers may include that they should not be torqued down flat. I do know even the Wikipedia page specifically says they are NOT a locking mechanism.

The Wikipedia page Ron links to makes a fascinating read.

In any case, for antenna mounting we need hardware that can sit up there for years in the sun, wind, snow, rain, etc. without requiring constant inspection and tightening.

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Steve Greenfield AE7HD