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The Unifix Grade 10.9 Socket Csk Head Screws are engineered for engineers, mechanics, and DIY enthusiasts who require maximum holding power for heavy-duty assembly projects. Built to DIN 7991 standards, these high-strength steel fasteners provide exceptional durability and a flush-fit finish, though they require a hex key or Allen wrench for proper tightening compared to standard Phillips or flathead screws.
| Colour | Silver |
|---|---|
| Model Part Number | 1261538 |
| Brand | Unifix |
Grade 10.9 refers to the strength rating of the steel. The first number (10) indicates the nominal tensile strength, and the second (0.9) indicates the yield strength, making these suitable for high-stress applications.
The zinc plating offers corrosion resistance suitable for indoor and sheltered outdoor environments, but they are not stainless steel and should be avoided in harsh, high-salt, or wet conditions.
You will need a standard metric hex key (Allen wrench) that fits the internal socket diameter of the specific screw size.
Yes, because they are manufactured from high-strength carbon steel, these screws will be attracted to a magnet.
DIN 7991 is the German industrial standard for hexagonal socket countersunk head screws, ensuring universal sizing and compatibility.
Ensure you are using the correct metric hex key size and that the key is fully inserted into the socket before applying torque.
Verify that your pilot hole is properly countersunk to the correct depth and angle matching the DIN 7991 standard.
Clean the affected area and apply a thin layer of machine oil or protective lubricant to restore the barrier against moisture.
To ensure the best results, always pre-drill the pilot hole and use a countersink bit to accommodate the screw head angle, ensuring the screw rests perfectly flush with your workpiece. When tightening, use a properly sized metric hex key to avoid rounding the internal socket. While the zinc plating provides moderate protection, it is recommended to apply a small amount of anti-seize compound if using these in automotive or long-term industrial applications to prevent the threads from binding over time.
