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The Range£7.41Visit shop Unifix Grade 12.9 Socket Head Cap Screws Din 912 Plain - M5 X 10 (Box Of 200) - Grey
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The Unifix Grade 12.9 Socket Head Cap Screws are high-strength fasteners engineered for demanding mechanical and structural engineering projects. Designed for professionals and experienced DIY enthusiasts who require maximum clamping force, these screws feature a robust Grade 12.9 steel construction that ensures superior tensile strength and longevity. While they provide exceptional reliability in heavy-duty applications, users should note that the high-carbon steel composition requires proper protection against moisture to prevent surface oxidation.
| Colour | Grey |
|---|---|
| Model Part Number | DIN 912 |
| Brand | Unifix |
Grade 12.9 refers to the material's mechanical properties, specifically that it has a minimum tensile strength of 1200 MPa and a yield strength of 90% of that value, making it one of the strongest standard fasteners available.
These screws are primarily designed for indoor or protected environments. If used outdoors, they must be regularly treated with rust inhibitors or protective coatings.
Yes, but you must be careful to set the torque limits appropriately to avoid stripping the hex socket or snapping the fastener.
DIN 912 is a German industrial standard that defines the dimensions, thread pitch, and geometry for socket head cap screws.
While often used without washers due to the design, a hardened washer can be used to protect the surface of the base material from indentation under high torque.
Ensure the Allen key is the correct metric size and is not worn down at the edges.
Check that the threads are clean of debris and use a thread lubricant if necessary.
The fastener is prone to oxidation; clean the surface with a wire brush and apply a protective oil or rust-inhibiting coating.
For optimal performance, always ensure you are using a high-quality Allen key that matches the socket size precisely to prevent slippage. When installing into metal substrates, it is recommended to tap the hole first or use a matching threaded insert. To maintain the integrity of the Grade 12.9 steel, keep the fasteners in a dry environment. If you are using these in a workshop setting, consider applying a light coat of machine oil to the threads during installation to prevent seizing and to add a thin layer of protection against atmospheric humidity.
