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The Range£7.68Visit 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 engineered for professionals and DIY enthusiasts requiring high-strength fasteners for demanding mechanical and structural applications. These screws are built to precise DIN 912 standards to ensure consistent quality and extreme load-bearing reliability; however, users should be aware that the high-tensile nature of Grade 12.9 steel makes them susceptible to hydrogen embrittlement if not stored or used correctly in certain chemical environments.
| Colour | Grey |
|---|---|
| Model Part Number | 1260457 |
| Brand | Unifix |
It refers to the mechanical properties of the steel. The '12' indicates a nominal tensile strength of 1200 MPa, and the '9' indicates the yield point is 90% of the tensile strength.
Yes, their high-tensile nature makes them suitable for critical structural assemblies, provided they meet the specific load requirements of your project.
A high-quality Allen key (hex key) or hex bit socket is required that fits the size of the screw head.
The standard Grade 12.9 finish is intended for internal or controlled industrial environments and offers limited rust protection.
DIN 912 is an international standard that defines the dimensions, thread pitch, and head geometry for hexagon socket head cap screws.
Ensure the Allen key is the exact size and is fully seated into the socket before applying torque.
Check that the threads are clean and free of paint or metal burrs; do not force the screw as it may cause cross-threading.
Apply a thin layer of machine oil or a clear protective coating if the environment is humid or prone to moisture.
For optimal results, ensure the tapped hole is clean and free of debris before insertion. Use a calibrated torque wrench with an appropriately sized hex bit to avoid cam-out or stripping the socket. Because Grade 12.9 screws are made from hardened alloy steel, keep them stored in a dry environment and lightly oiled to prevent oxidation. If using these in outdoor or corrosive environments, consider applying a suitable anti-seize compound or choosing a finish-protected variant, as the standard grey finish provides minimal rust resistance.
