Why does the long thin stainless screws bear uneven force?

Sometimes when we twist long thin stainless screws, we will feel that the force of the screw is not even. Why is that?

The uneven loading of long thin stainless screws is mainly due to the following reasons: one is that the perpendicularity of the supporting surface of the nut to the axis of the screw is not in the same center. For long thin stainless screws with surface treatment, it is easier for the screws to bend during the surface treatment. This is because most of the surface treatment involves rolling the screws around to make the surface even. In this process, long, thin screws bend easily. It is also possible that the mold position has moved during the production, and this situation will also occur.

Two are the thickness of the nut itself has a deviation. The main reason for the thickness deviation is that the machine was not properly adjusted during debugging, which led to the occurrence of the head of the screw with one side thicker and the other side thinner during production.

The three screws are installed on the locked product at an Angle instead of being properly set when turning the long thin stainless screws. The installation should be to see whether the screw has been placed, in a slow, flat, smooth way to gradually apply force to lock the screw.

The four products that are locked are inclined and have a certain Angle, so a wrench is needed to make the force of the long thin stainless screws be correct during installation.