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The Range£15.71Visit shop Unifix Grade 12.9 Socket Head Cap Screws M4 X 40 - Q129120000400040270 - Box Of 200 - Grey
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The Unifix Grade 12.9 Socket Head Cap Screws are engineered for professionals and DIY enthusiasts who require high-strength fastening solutions for heavy-duty industrial or mechanical projects. Built to rigorous DIN 912 standards, these screws offer exceptional durability and a sleek, professional grey finish; however, users should ensure they are using the correct hex key size for the specific bolt diameter to prevent stripping the socket head.
| Colour | Grey |
|---|---|
| Model Part Number | 1261664 |
| Brand | Unifix |
Grade 12.9 indicates the mechanical properties of the steel, specifically the high tensile strength (1200 N/mm²) and yield strength (1080 N/mm²).
No, these are high-tensile alloy steel screws. They are not designed for direct exposure to marine or highly corrosive environments without additional protection.
You will need a standard metric hex key (Allen wrench) that matches the specific diameter of the socket head cap screw you are using.
Yes, they are manufactured to DIN 912 standards, which is a common international standard for socket head cap screws.
These are primarily for mechanical and industrial fastening. For structural building, consult a structural engineer to ensure they meet local building codes.
Ensure the hex key is fully inserted into the socket and is of the correct metric size; do not use worn tools.
Check the hole for debris or metal shavings and ensure the bolt and tapped hole threads are aligned correctly.
While these are high-strength industrial screws, they may require a light coating of machine oil if used in high-humidity conditions.
For optimal performance, always match the screw thread pitch and length precisely to your application requirements as per DIN 912 data. Use a high-quality hex key that fits the socket depth completely to distribute force evenly across the drive faces. If you are working in a damp or highly corrosive environment, consider adding a thin film of anti-seize lubricant to the threads during installation. Regularly inspect the socket heads for signs of corrosion or rounding, and replace any hardware that shows structural degradation after significant stress cycles.
