| Customization: | Available |
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| Connection: | Common Bolt |
| Head Style: | Round |
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Generally speaking, the expansion screw is a metal expansion screw, and the fixing of the expansion screw is to use the wedge inclination to promote the expansion to produce friction gripping force to achieve the fixed effect. One end of the screw is threaded and the other end has a taper. The outer bread is a iron sheet (some steel pipe), the iron cylinder (steel pipe) half has a number of cuts, put them together into the hole made in the wall, and then lock the nut, the nut pulls the screw outward, pulls the taper into the iron cylinder, the iron cylinder is expanded, so firmly fixed on the wall,
The spring pad on the expansion screw is a standard part, because its opening is staggered and elastic, so it is called the spring washer, the role of the spring washer is to use the sharp Angle of the wrong mouth to puncture the nut and the pad to prevent the nut from loosening.
The flat washer is also a standard part, and its function is to evenly distribute the pressure of the nut to the connected parts.
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