Description: 411 expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener / 411 expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener/(190) having structure to restrict rotation of threaded, mating pieces (e.g., nut lock) (204) structure is coaxial, distinct member (e.g., washer, key, or nut portion) that restricts nut piece (209) member includes key, screw, tongue, etc. perpendicular to threads (210) utilizing a resilient characteristic of the key, or of a discrete element (211) with a discrete, resilient element
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