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The Range£19.70Visit shop Unifix Grade 12.9 Ht Hexagon Bolts Din 931 S/Col - M10 X 40 - Box Of 100 - Grey
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This guide is for professionals and DIYers requiring robust fastening solutions for demanding applications. The Unifix Grade 12.9 HT Hexagon Bolts offer superior tensile strength and durability. A potential caveat is that their high-strength rating may be overkill for light-duty projects, making them less economical for such uses. Key features include high-tensile Grade 12.9 material, durable construction, versatile application suitability, and ease of installation with standard tools.
| Colour | Black |
|---|---|
| Model Part Number | DIN 931 |
| Brand | Unifix |
'Grade 12.9' refers to the bolt's mechanical properties, specifically its high tensile strength (minimum 1200 N/mm²) and hardness. It indicates a superior performance level compared to lower grades like 8.8 or 10.9.
They offer some corrosion resistance due to their material and finish, making them suitable for many outdoor applications. However, for prolonged exposure to harsh elements or marine environments, consider stainless steel options.
An M10 socket wrench or spanner is required to tighten the hexagon head. Ensure the tool fits snugly to avoid damaging the head.
Yes, their high tensile strength (Grade 12.9) makes them suitable for many structural applications where high load-bearing capacity is critical, provided they are used in accordance with engineering specifications.
DIN 931 bolts have a partially threaded shank, while DIN 933 bolts have a fully threaded shank. This particular product is DIN 931, meaning it has a portion of the shank without threads.
Store them in a dry, protected environment, preferably in their original packaging or a suitable container, to prevent moisture exposure and physical damage to the threads and heads.
The black finish is typically a result of heat treatment (black oxide). It provides a degree of corrosion resistance but is not a heavy protective coating like zinc plating.
Ensure the hole is correctly tapped with an M10 thread and that no debris is present. Verify the bolt is not cross-threaded.
Use a high-quality socket or wrench that fits the head precisely. Ensure the tool is perpendicular to the bolt head. Reduce torque if necessary and assess if a higher grade tool or different fastening method is required.
Confirm the bolt's grade (12.9) is sufficient for the application's tensile and shear requirements. Check if the load is within the bolt's rated capacity and if the joint design is adequate.
This indicates exposure to moisture or corrosive substances. Clean the bolt and apply a protective coating. For critical applications, consider stainless steel alternatives if corrosion is a persistent issue.
Setup: These bolts are designed for straightforward installation. Ensure the mating components have appropriately sized, tapped holes or nuts. Use a socket wrench or spanner that fits the M10 hexagon head snugly to apply torque. Always use washers where appropriate to distribute load and protect surfaces. Do not overtighten, as this can strip the threads or damage the bolt head. Refer to torque specifications for your specific application if available.
Compatibility: The DIN 931 standard ensures compatibility with standard nuts and pre-tapped holes designed for this specification. The M10 thread size is widely recognized. The black finish offers some inherent corrosion resistance but is not intended for prolonged direct exposure to highly corrosive elements without additional protection.
Care: To maintain corrosion resistance, inspect bolts periodically. If used in environments prone to rust or chemical exposure, consider applying a suitable sealant or lubricant. Clean bolts with a dry cloth. Avoid abrasive cleaners that could damage the finish. Store in a dry environment to prevent premature degradation.
