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B&Q£12.51Visit shop B&Q - Grade 10.9 Socket Csk Head Screws Din 7991 BzpM6 X 40Box Of 200
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The Range£13.71Visit shop Unifix Grade 10.9 Socket Csk Head Screws M4 X 10 - Box Of 500 - Grey
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The Unifix Grade 10.9 Socket Countersunk Head Screws are designed for professionals and DIY enthusiasts who require high-strength fastening solutions for structural and mechanical projects. Built to DIN 7991 standards, these screws offer exceptional durability and a flush-finish appearance, making them ideal for heavy-duty applications where aesthetics and security are paramount; however, users should ensure they have the correct metric hex key size, as the socket head requires specific tooling for proper installation.
| Colour | Silver |
|---|---|
| Model Part Number | 1261635 |
| Brand | Unifix |
It refers to the tensile strength properties of the steel, with 10.9 being a high-strength, heat-treated alloy steel ideal for structural applications.
They feature a bright zinc plating which provides basic corrosion resistance, but they are not recommended for salt-air or constant wet environments.
Yes, you require a standard metric hex key (Allen key) that matches the size of the socket head.
It is a German standard (Deutsches Institut für Normung) that defines the dimensions and specifications for hexagon socket countersunk head screws.
Yes, due to the high-strength steel composition, these screws will be attracted to a magnet.
The hole has not been countersunk deep enough or at the correct angle. Re-drill with a countersink bit.
Ensure you are using the correct metric hex key size and that it is fully seated in the socket before applying torque.
For successful installation, ensure you are using a high-quality, hardened steel hex key that fits the socket perfectly to avoid stripping the internal drive. Before driving the screw, prepare your material by drilling a pilot hole followed by a countersink bit at the appropriate angle (usually 90 degrees) to accommodate the head profile. While the bright zinc plating provides good indoor and protected-outdoor rust resistance, periodically inspect the heads for signs of oxidation if exposed to damp conditions. Always use a matching nut or threaded insert that corresponds to the specific metric thread size of your screw.
