Why Are Extended Hex Socket Cap Screws Often Made in Grade 12.9 High Strength?

Release time：2020-01-16 18:44 Browse：

Extended hex socket cap screws are often used in applications requiring both compact design and high clamping force. Using Grade 12.9 steel provides several advantages:

1. High Tensile Strength:
   Grade 12.9 screws offer a tensile strength of up to 1220 MPa, making them ideal for high-load applications.

2. Durability Under Stress:
   Longer screws are subject to more bending and tension forces. High-strength material ensures they won’t deform or break easily.

3. Precision Fit and Torque Resistance:
   Internal hex drives need to withstand high tightening torques. Grade 12.9 material prevents head stripping and ensures reliable performance.

4. Space-Saving Design:
   In designs where size is limited, using fewer high-strength screws instead of multiple lower-strength ones reduces weight and space.

5. Consistency in Industrial Standards:
   Many mechanical, automotive, and engineering industries standardize on Grade 12.9 for critical structural connections, especially for longer fasteners.