National Standard Expansion Bolts

National standard expansion bolts have a delicate and practical structural design. It mainly consists of screw, expansion tube, flat washer, spring washer and nut. Screw is usually made of high quality carbon steel, after fine processing, smooth surface and thread uniformity and clear, with excellent tensile and shear resistance. The expansion tube is elastic and reliable, and its outer diameter closely matches the diameter of the installation hole. During installation, when the bolt is inserted into the pre-drilled hole and the nut is tightened, the screw pulls on the expansion tube and expands it outward. Then, the wall of the hole is squeezed tightly, forming an extremely solid connection by virtue of the combined effect of friction and squeezing force.

In the field of construction, it is widely used in all kinds of walls and floors for fixing the bracket of air-conditioner outside unit, water heater hanging bracket, pipe bracket and so on. It can withstand a certain weight and external impact, to ensure the safety and stability of the hanging equipment. In indoor decoration, it is used to install chandeliers, wall-mounted TV stands, etc. to meet the fixing needs in the home environment.

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