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) (259) comprising a thread lock (276) having the internally threaded element distorted (277) radially inward distortion (281) of circumferentially spaced areas of continuous periphery (283) impacted areas (284) located on the flats of a polygonally shaped element
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