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The Range£8.36Visit shop Unifix Grade 8.8 Ht Hexagon Bolts Din 931 S/Col - M6 X 40 - &Mhb06 040 000 - Grey
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This guide is for construction professionals and DIY enthusiasts who need robust fastening solutions. The Unifix Grade 8.8 HT Hexagon Bolts offer exceptional strength and durability for heavy-duty applications. A potential caveat is their specific size (M20 x 70), requiring careful consideration for compatibility with existing projects. These bolts are designed for high tensile applications, ensuring secure connections in demanding environments. Key features include high tensile strength, durable Grade 8.8 steel construction, versatile use, and easy installation due to their hexagon head design.
| Colour | Black |
|---|---|
| Model Part Number | DIN 931 |
| Brand | Unifix |
'Grade 8.8' refers to the mechanical properties of the steel, indicating its high tensile strength. 'HT' stands for High Tensile.
These bolts conform to the DIN 931 standard for hexagon head bolts with partial thread.
The product description indicates these are hexagon bolts. Nuts are typically sold separately and need to match the M20 size.
A standard wrench or socket set that fits an M20 hexagon head is required for installation.
While durable, Grade 8.8 steel can corrode over time. For outdoor use, consider applying a protective coating or using stainless steel alternatives if corrosion is a major concern.
For standard M20 bolts, the common thread pitch is 2.5mm.
Store in a clean, dry place to prevent oxidation and corrosion. Keeping them in their original packaging or a sealed container is recommended.
Ensure the bolt threads and the mating hole/nut threads are clean and free from debris or damage. Verify you are using the correct M20 size and pitch.
Use the correct size wrench or socket for the M20 hexagon head. Ensure the bolt is aligned properly with the hole and mating thread. Do not overtighten, which can strip threads.
Clean the affected area with a wire brush. For prolonged protection, apply a rust inhibitor or protective coating suitable for steel fasteners, especially if used outdoors or in humid conditions.
Setup: To install, select the appropriate tool, such as a socket wrench or adjustable wrench, that fits the M20 hexagon head. Ensure the mating hole is clear of debris and the thread is clean. Insert the bolt through the materials to be joined and secure with a matching M20 nut (not included) or thread into a pre-tapped hole.
Compatibility: These bolts are designed to conform to DIN 931 standards, meaning they are compatible with standard M20 nuts and M20 tapped holes. They are intended for use with materials that can accept a bolt of this diameter and thread pitch. Ensure the required clearance for the M20 size is available.
Care: While Grade 8.8 steel offers good durability, it is recommended to store these bolts in a dry environment to prevent corrosion. For applications exposed to harsh elements, consider using protective coatings or lubricants. Periodically inspect connections made with these bolts for signs of wear or corrosion, especially in critical load-bearing applications.
