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Star washers, also referred to as toothed lock washers and serrated washers, are disk-shaped devices with inward or outward radial serrations. These serrations grip into the material for an increased locking force to prevent it from loosening. Aside from their locking capabilities, star washers are also used in electrical or ground bonding to a surface since their teeth cut through oxides and coatings to provide a conductive path. Star washers are available in different sizes to meet various fastening requirements.

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