self drilling sheet metal screws

The functionality of metal expansion nuts centers around the principle of mechanical expansion. Upon the application of torque, the screw or bolt is threaded into the nut, which, in turn, causes the nut to expand outward. This outward expansion presses the sides of the nut against the inner walls of the hole it occupies, creating a tight fit. The added friction and mechanical grip prevent the nut from loosening over time, even in dynamic conditions.


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Overall, 75mm tek screws are a versatile and reliable fastening solution for a wide range of construction and DIY applications. Whether you are building a new structure or repairing an existing one, these screws offer a secure and efficient way to connect materials together. With their self-drilling capabilities, strong grip, and corrosion resistance, 75mm tek screws are sure to provide a lasting and dependable fastening solution for all your projects.

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The black coating on these screws adds an additional layer of utility. Typically, this coating is a form of zinc plating or a powder coat finish, which serves two primary purposes. Firstly, it enhances the screw's corrosion resistance, protecting it from rust and wear, especially in outdoor or humid conditions. Secondly, the black color offers a sleek, unobtrusive appearance, making it suitable for applications where a discreet fastener is desired.

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