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The Range£25.33Visit shop Unifix Grade 12.9 Ht Hexagon Setscrews Din 933 S/Col - M16 X 45 - Grey
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The Unifix Grade 12.9 High Tensile Hexagon Setscrews are essential components for professionals and DIY enthusiasts working on demanding construction and engineering projects where structural integrity is paramount. These fasteners offer exceptional load-bearing strength thanks to their high-grade steel composition, though users should note that they require specific tools for proper torque application and are susceptible to surface corrosion if exposed to harsh environments without protective coatings.
| Colour | Black |
|---|---|
| Model Part Number | DIN 933 |
| Brand | Unifix |
Grade 12.9 refers to the tensile strength of the steel; it is one of the strongest grades available for alloy steel fasteners, suitable for extreme heavy-duty use.
They are generally intended for indoor or protected engineering applications. If used outdoors, they must be treated with a corrosion-resistant coating.
No, a standard metric wrench or socket set corresponding to the bolt size is sufficient for installation.
DIN 933 specifies that the screw is fully threaded from the head to the tip, which is ideal for applications requiring continuous engagement.
If the threads and the head remain in good condition without signs of stretching or deformation, they can be reused, though critical structural applications often mandate new hardware.
Check the thread pitch to ensure it matches the female component; do not force the screw as it may cross-thread.
Clean the affected area with a wire brush and apply a protective rust-inhibiting lubricant or paint.
Ensure the socket or wrench is the exact size required and fully seated on the head before applying pressure.
To install, ensure the mating surface is clean and the bolt hole is correctly aligned. Use an appropriate wrench or socket to drive the bolt until it is firmly seated. Because these are black-finished steel, it is highly recommended to apply a light film of machine oil or use an anti-seize compound if the environment poses a moisture risk to prevent oxidation. Store these screws in a dry container to avoid surface corrosion during long-term storage.
