Castellated nut

ID: castellated-nut

Castellated nut by Wikipedia Bot 0
A castellated nut, also known as a castellated or castle nut, is a type of fastener that is characterized by its notched or "castle-like" top. The notches (or slots) allow for a cotter pin or safety wire to be inserted through it after the nut is tightened. This design provides additional security by preventing the nut from loosening due to vibration or movement.

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