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The Range£26.80Visit shop Unifix Grade 12.9 Ht Hexagon Bolts Din 931 S/Col - M16 X 70 - Box Of 25 - Grey
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The Unifix Grade 12.9 HT Hexagon Bolts DIN 931 are high-tensile fasteners designed for professional construction, automotive, and machinery applications where superior strength and reliability are critical. These bolts offer exceptional load-bearing capabilities due to their 12.9 grade rating, making them ideal for high-stress environments. However, users should note that the high tensile material can be more susceptible to hydrogen embrittlement if improperly plated or exposed to specific chemical environments, requiring careful selection for specialized industrial conditions.
| Colour | Grey |
|---|---|
| Model Part Number | DIN 931 |
| Brand | Unifix |
The 12.9 designation refers to the bolt's mechanical properties, indicating a high tensile strength of approximately 1200 MPa, making it one of the strongest standard steel bolts available.
No, these are DIN 931 bolts, which means they are partially threaded with a plain shank.
They are suitable for general construction but are not stainless steel; therefore, they may rust if exposed to constant moisture or harsh weather without additional protection.
A standard hexagon socket wrench or a ring spanner of the correct metric size is ideal.
If the threads are not damaged and the bolt has not been stretched beyond its elastic limit, they can generally be reused, though safety-critical applications often dictate using new fasteners.
Check the thread pitch compatibility and ensure there is no paint or rust debris inside the receiving hole.
Ensure the socket or wrench size matches precisely; avoid using worn tools that do not provide a snug fit.
Verify the torque specifications for the bolt diameter and grade; you may be exceeding the maximum tensile capacity.
To ensure peak performance, always match these bolts with compatible nuts of the same or higher strength grade (12.9) to prevent thread stripping or failure. When installing, ensure the bolt hole is clean and free of debris. While the bolts feature a robust finish, avoid using abrasive cleaning agents that could strip the surface protection. For long-term installations in outdoor or damp conditions, consider applying a thin layer of anti-seize or a suitable industrial lubricant to prevent corrosion and make future removal easier.
