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The Unifix Grade 12.9 HT Hexagon Bolts are essential for professionals and DIY enthusiasts working on high-stress mechanical, automotive, or construction projects that require superior structural integrity. These bolts provide exceptional tensile strength and long-term durability; however, users should ensure they are using the correct torque specifications for their specific application to avoid material failure.
| Colour | Grey |
|---|---|
| Model Part Number | DIN 931 |
| Brand | Unifix |
The 12.9 grade refers to the tensile strength and yield strength of the steel, making it one of the strongest standard steel bolt grades available.
They feature corrosion resistance, but if used in highly saline or wet environments, additional protective coatings or stainless steel alternatives may be preferred.
DIN 931 indicates these are partially threaded bolts. If you require full threading, look for DIN 933 specifications instead.
A standard metric socket set or open-ended wrench matching the head size of the bolt is required.
In high-stress or critical structural applications, it is highly recommended to replace bolts with new ones once they have been removed or torqued to their limit.
Ensure you are using the correct size socket or wrench and that it is fully seated on the hexagonal head before applying force.
Check the thread pitch and diameter to ensure it matches the nut or tapped hole. Do not force the bolt as this can damage the threads.
