Brief introduction of expansion screws
The expansion screw is generally referred to as a metal expansion screw. The fixing principle of the expansion screw is to use the wedge-shaped inclination to promote the expansion to produce a frictional grip force to achieve a fixed effect. The screw has a thread at one end and a taper at the end. The outer bread is a tin (some steel pipes), the iron cylinder (steel pipe) has a few cuts in half, and they are stuffed together into the hole in the wall, then the nut is locked, the nut is pulled outward, and the taper is pulled into the iron cylinder. The iron cylinder is opened, so it is tightly fixed on the wall, and is generally used for fastening the fence, awning, air conditioner and the like on cement, brick and the like. However, its fixing is not very reliable. If the load has a large vibration, looseness may occur, so it is not recommended to install a ceiling fan.
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