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The Range£6.81Visit shop Unifix Grade 10.9 Socket Csk Head Screws M3 X 8 - Q107991000300008000 - Box Of 500 - Grey
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The Unifix Grade 10.9 Socket Button Head Screws are designed for professional engineers, machinists, and DIY enthusiasts who require high-tensile fasteners for heavy-duty applications. These screws offer excellent structural integrity and a low-profile aesthetic, making them ideal for machinery and automotive assemblies where clearance is a concern. While they provide superior strength compared to standard hardware, they require a specific hex key size for installation and should not be used in highly corrosive environments without additional protection.
| Colour | Black |
|---|---|
| Model Part Number | 1261792 |
| Brand | Unifix |
Grade 10.9 is a metric strength designation indicating a high-tensile steel capable of withstanding significant stress before deformation.
These are generally intended for machine assemblies and mechanical fastening rather than structural timber framing.
You only need a standard hex key (Allen wrench) that matches the size of the internal socket.
Yes, because they are manufactured from high-tensile steel, they are magnetic.
It is not recommended, as the black finish will not prevent rust in saltwater conditions; stainless steel is preferred for marine use.
Ensure you are using the correct metric hex key size and that the tool is fully seated in the socket.
Verify if the material requires a countersink or if the screw length exceeds the intended application thickness.
The screws have been exposed to moisture; clean with a wire brush and apply a protective rust-preventative coating or paint.
To ensure the longevity of your assembly, always match the thread pitch and diameter to your pre-drilled holes or tapped components. Use a high-quality, hardened steel hex key to prevent rounding out the internal socket of the screw.
For care, keep these screws in a dry, moisture-free environment to prevent oxidation of the black finish. If installing in an outdoor or damp environment, apply a light coat of machine oil or a corrosion inhibitor to the screw head and threads. Do not over-torque beyond the recommended specifications for Grade 10.9 fasteners to avoid thread failure.
