Release time：2020-01-16 18:44 Browse：
In theory, the tensile strength of a screw is determined by the material strength and the effective stress area.
Increasing the length does not directly change the tensile strength of the material. However, when a screw is too long, it becomes more prone to buckling or breaking under tension, especially if it is thin and slender.
When a screw is mainly under shear force, the strength depends on the location and number of shear planes, not on the length.
However, if a long screw is only stressed in a short section, it may lead to uneven force distribution and lower performance.
Long screws are more likely to bend or become misaligned during installation.
Manufacturing precision becomes more critical; poor coaxiality between the thread and the shank can reduce strength.
If the screw is made using hot forging (hot heading), the coarse grain structure can reduce mechanical performance.
Material, diameter, and heat treatment are the primary factors that determine screw strength. Length only has an indirect effect.
For long screws, it is recommended to:
Use cold heading process
Avoid overly thin shank diameter
Strengthen the initial threaded section if needed
