One is the unreasonable sequence of tightening the prefabricated components. Other screws and hexagon socket stainless steel screws have uneven ground stress, resulting in a reduction in the friction surface of the force transmission. The screw has a slight offset in the hole, and it is loosened by the external force of the reciprocating load for a long time.
The second is that the external thread cotton of the hexagon socket stainless steel screw is polluted or damaged by the environment, which leads to the reduction of the anti-skid index of the external thread itself.
Third, the inclination angle of the external thread of the hexagon socket stainless steel screw exceeds the self-locking angle. When the static friction resistance μ of the non-smooth surface layer is higher than or equal to tgα (α is the inclination angle of the inclined surface), the object is not easy to fall, causing self-locking, so it is related to the inclined surface inclination angle. That is, the sliding force down the inclined plane is not greater than the sliding friction force.
