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Rackhams£5.33Visit shop Rackhams M5 Socket Cap Allen Screw Bolt High Tensile 12.9 Bzp - 4 - 35Mm
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The Range£10.57Visit shop Unifix Grade 12.9 Socket Head Cap Screws Din 912 Bright Zinc Plated - M5 X 30 (Box Of 200) - Grey
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The Unifix Grade 12.9 Socket Head Cap Screws are designed for mechanical engineers, fabricators, and DIY enthusiasts who require high-tensile fasteners for heavy-duty industrial applications. These screws provide exceptional structural integrity and reliable tightening in critical assembly projects, though users should ensure they have the correct hex key size to prevent rounding the internal drive during high-torque installations.
| Colour | Silver |
|---|---|
| Model Part Number | 1261906 |
| Brand | Unifix |
The 12.9 rating indicates the highest strength grade for alloy steel screws, signifying a minimum tensile strength of 1220 MPa.
These screws are finished for a clean look, but they are not stainless steel. They are best suited for indoor or climate-controlled environments to prevent surface rust.
While they are robust, it is generally advised to replace high-tensile fasteners after they have been tightened to their yield point in critical applications.
A standard, high-quality hex key (Allen wrench) of the appropriate size is required for proper installation.
Identify your thread diameter (e.g., M4, M5) and desired length based on your project assembly requirements and the depth of the tapped hole.
Ensure you are using the correct metric hex key size and that the key is not worn. If the socket is already stripped, use a screw extractor.
Check the thread pitch and diameter match the tapped hole. Ensure there is no debris or paint inside the hole.
To ensure maximum safety, always verify that the screw size and thread pitch match the tapped hole or nut exactly. When installing, use a high-quality, hardened steel hex key to apply uniform torque. It is recommended to use a calibrated torque wrench for critical assemblies to reach the manufacturer's specified preload without over-stressing the fastener. To maintain the finish and prevent surface oxidation, keep the screws in a dry environment and avoid exposure to harsh chemicals or moisture. Periodically inspect installed screws for signs of fatigue or loosening during routine maintenance cycles.
