washer head machine 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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In conclusion, 150mm self-drilling screws are a versatile and reliable fastening solution for a wide range of applications. Their ability to drill their own holes and create secure connections makes them a popular choice among professionals and DIY enthusiasts alike. Whether you are working on a construction project, repairing a piece of furniture, or assembling machinery, self-drilling screws can provide the stability and strength you need to get the job done right.

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