Thumb Screw M4

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Clamp Fastener A thumb screw, also known as a cap screw or wing nut, is a type of fastener that is tightened or loosened by hand without the need for any tools. It consists of a threaded rod with a circular head designed to be turned using your fingers. The term "thumb screw" is often used interchangeably with other names like clamp fastener, cap screw, wing nut, and wing bolt, all referring to similar devices that provide a quick and convenient way to secure or release an object.