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The Unifix Grade 8.8 HT Hexagon Bolts are essential heavy-duty fasteners designed for professionals and DIY enthusiasts working on demanding construction and engineering projects. These bolts provide high tensile strength and superior load-bearing capacity, making them ideal for structural assemblies where reliability is paramount. One important caveat is that while the Bright Zinc Plated (BZP) coating offers improved corrosion resistance, these bolts are primarily intended for environments where extreme long-term exposure to salt or harsh chemicals is not the primary factor.
| Colour | Grey |
|---|---|
| Model Part Number | 1269584 |
| Brand | Unifix |
Grade 8.8 indicates the tensile strength of the bolt, where the first number (8) refers to the minimum tensile strength and the second number (.8) represents the yield-to-tensile ratio.
The BZP coating provides moderate corrosion resistance, but it is generally recommended to use Stainless Steel A4 bolts for direct marine or high-salt exposure.
Yes, the standard hexagon head is specifically designed to work seamlessly with professional torque wrenches for precise assembly.
DIN 931 ensures the bolt has a specific length of thread relative to the total length, which is crucial for applications requiring a non-threaded shank for load bearing.
If the threads are not damaged or stretched during the initial installation, they can generally be reused, though critical structural applications usually require new hardware.
M20 bolts typically require a 30mm spanner or socket for the head, though you should verify with a caliper before starting.
Check for debris or paint inside the thread; use a thread tap to clear the passage before re-inserting.
Clean the surface with a wire brush and apply a clear coat or zinc-rich primer to seal the affected area.
Ensure the spanner size perfectly matches the hexagon head and confirm the wrench is fully seated before applying force.
To install these bolts effectively, ensure you are using a matching nut grade (typically Grade 8) to maintain the strength of the assembly. Always use washers to distribute the clamping force evenly across the surface of the material, preventing the bolt head from sinking into softer substrates. Avoid using high-impact power tools on BZP coatings if you want to preserve the finish, as this can chip the plating and expose the bare metal to moisture. Regularly inspect the torque on critical joints annually, especially in high-vibration applications, to ensure no loosening has occurred.
