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Brief introduction of stainless steel expansion screw


Stainless steel expansion screws are generally referred to as metal expansion screws. The expansion screw is fixed by using the wedge-shaped slope to promote the expansion to generate friction and grip force to achieve the fixing effect.

Stainless steel expansion screw - fixing principleThe stainless steel expansion screw is composed of a screw and an expansion tube. The tail of the screw is conical, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the axial movement of the thread causes the cone to move, thereby forming a large positive pressure on the outer peripheral surface of the expansion tube, and the angle of the cone is small, so that the wall, the expansion tube Friction self-locking is formed between the cone and the cone, and then the fixing effect is achieved.

The spring washer on the expansion screw is a standard part, because its opening is staggered and has elasticity, so it is called a spring washer. The function of the spring washer is to use the sharp corner of the staggered hole to penetrate into the nut and flat washer to prevent the nut from loosening, and the flat washer is also Standard parts, its function is to evenly distribute the pressure of the nut on the connected parts.

Application range of stainless steel expansion screws

Expansion screws have small drilling holes, high tension, and are exposed flat after use. If not used, they can be removed at will. The advantages of keeping the wall flat are significant, and are widely used in various decoration occasions:

☆ Fasten air conditioners, water heaters, range hoods, etc.;

☆ Fix frameless balcony windows, anti-theft doors and windows, kitchen, bathroom components, etc.;

☆ Ceiling screw fixing (used in combination with casing and cone cap);

☆ Other occasions that need to be fixed.

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