hex locknut

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Distorted thread locknut — A distorted thread locknut,[1] is a type of locknut that uses a deformed section of thread to keep the nut from loosening from vibrations or rotation of the clamped item. They are broken down into three types: elliptical offset nuts, centerlock… … Wikipedia
Nut (hardware) — A nut threaded onto a bolt A nut is a type of hardware fastener with a threaded hole. Nuts are almost always used opposite a mating bolt to fasten a stack of parts together. The two partners are kept together by a combination of their threads… … Wikipedia

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