fiber vs. metal lock nuts

[Ronald Shannon]

Assuming equal or better strength, is there any application where a metal
self-locking nut (ex. MS21042) should not be used instead of a fiber nut?
The MS21042's have a smaller wrench bearing area, but are lighter. It has
been suggested the metal grip may be harder on bolt threads, affecting bolt
re-use, but other than those that...what advantage does a fiber nut have
over a metal self-locking nut, if any?

Ron




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