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The Range£22.97Visit shop Unifix Grade 10.9 Ht Hexagon Bolts Din 931 S/Col - M12 X 50 - Box Of 100 - Grey
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The Unifix Grade 10.9 High Tensile Hexagon Bolts are an ideal choice for professional engineers, construction contractors, and DIY enthusiasts who require high-strength fastening solutions for heavy-duty assembly. These bolts provide superior load-bearing capacity and resilience in critical structural applications, though users should note that the black finish is not corrosion-resistant and may require additional treatment or protective coatings when used in damp or outdoor environments.
| Colour | Black |
|---|---|
| Model Part Number | DIN 931 |
| Brand | Unifix |
The '10' represents a tensile strength of 1000 MPa, and the '9' indicates that the yield strength is 90% of the tensile strength.
No, these bolts have a black finish and are not galvanized, meaning they offer no inherent corrosion resistance.
A standard 19mm socket or spanner is required for the head of an M12 hexagonal bolt.
Yes, provided they meet the specific load requirements and regulations of your project's engineering plans.
These bolts are manufactured to DIN 931, which signifies they are partially threaded, meaning there is a smooth shank section below the head.
Verify that both components are M12 metric thread and check for debris or paint inside the nut.
Clean the area with a wire brush and apply a protective oil, wax, or anti-corrosion paint.
Installation of these bolts is straightforward; use a 19mm socket or spanner to secure the head. Ensure the bolt is inserted into a properly sized hole to prevent movement and shear stress. Because these bolts are black-finished, they are susceptible to rust if exposed to moisture. If using these outdoors, it is highly recommended to apply a coat of rust-inhibiting paint or grease to the threads and exposed head. Regularly check the bolt for any signs of surface rust or loosening, especially in high-vibration applications. Always ensure the nut paired with the bolt is also rated for at least Grade 10.9 to maintain the strength of the assembly.
