Release time：2020-01-16 18:44 Browse：
The theoretical tensile strength per unit area does not change if the material, diameter, and heat treatment remain the same.
However, in practical applications, increasing the length does affect the overall performance under tension.
Tensile strength refers to the maximum load a material can withstand per unit area before breaking.
So, even if a screw becomes longer, if the diameter and material stay the same, the tensile strength value (MPa or psi) is unchanged.
| Factor | Description |
|---|---|
| Deformation Risk | Longer screws are more likely to stretch or deform under the same load. |
| Lower Stiffness | As length increases, the screw's overall rigidity drops, making it more vulnerable to bending or snapping. |
| Unstable Installation | Longer screws are harder to align during installation, and uneven torque or misalignment can reduce performance. |
| Manufacturing Tolerances | Longer screws are more prone to bending or concentricity issues, which may affect real-world tensile strength. |
Use higher-strength materials – such as SCM435, 10.9-grade steel, etc.
Enhanced heat treatment – like carburizing, quenching, or special coatings (e.g., Ruspert, DACROMET).
Increase the diameter – a thicker core helps improve actual load capacity.
Design structural reinforcements – such as thicker mid-sections or support sleeves.
Use guiding sleeves or washers – to reduce stress during installation and operation.
While the tensile strength per unit area remains the same, longer screws are more prone to deformation, bending, and failure under load due to reduced stiffness and structural stability.
If you have a specific screw type (e.g., 6.3mm double thread, 350mm long) and application scenario, I can help you evaluate or suggest improvements for safe usage.
Would you like a sample strength analysis or recommendation for your current product?
