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B&Q£21.98Visit shop B&Q - M12 X 90 Hexagonal Bolt High Tensile 8.8 Din 931 Bright Zinc Plated (Bzp) 25 Pack
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This guide is for professionals and DIY enthusiasts requiring robust fastening solutions. The Unifix Hexagonal Bolt (M12 x 90) offers high tensile strength and durable corrosion resistance, making it ideal for demanding construction, automotive, and machinery applications. A potential caveat is the specific BZP finish, which while offering good protection, may not be suitable for all extreme environments.
| Colour | Silver |
|---|---|
| Model Part Number | M12 X 90 |
| Brand | Unifix |
Grade 8.8 HT signifies high tensile strength. It indicates the bolt's mechanical properties, specifically its yield and ultimate tensile strength, making it suitable for demanding applications.
DIN 931 specifies bolts with a partially threaded shank, while DIN 933 specifies fully threaded bolts. These M12 x 90 bolts are DIN 931, meaning they have a portion of the shank unthreaded.
While the BZP finish offers some corrosion resistance, it is not ideal for constant exposure to saltwater. For marine applications, stainless steel bolts are generally recommended.
The clear pass is a post-treatment applied over the zinc plating to enhance corrosion resistance and provide a brighter finish. CR3+ indicates a trivalent chromium passivation, which is an environmentally friendlier alternative to hexavalent chromium.
This listing is for a pack containing 25 pieces of Unifix Hexagonal Bolts.
You will need a standard metric wrench or socket set. For an M12 bolt, a 19mm wrench or socket is typically required.
Ensure you are using the correct size wrench (typically 19mm for M12). Apply steady, even pressure. If the head is already damaged, a bolt extractor may be necessary.
Check that the bolt is aligned correctly with the hole or nut. Ensure the threads on both the bolt and the receiving component are clean and undamaged. Verify you are using an M12 nut or thread.
The BZP finish offers good protection, but prolonged exposure to moisture or corrosive substances can cause surface rust. For critical applications, consider re-coating or replacing with stainless steel. For minor surface rust, it may be possible to clean gently.
Setup: These bolts require a corresponding M12 nut or a pre-tapped hole of the same thread size. Ensure the mating surface is clean and free from debris. Use a standard metric wrench (e.g., 19mm socket or spanner) to tighten the bolt to the required torque specification, taking care not to overtighten, which could damage the threads or the workpiece.
Compatibility: Designed to the DIN 931 standard, these bolts are compatible with standard M12 nuts and tooling. They are suitable for use with materials such as steel, aluminum, and certain plastics, provided the appropriate washers and torque settings are used.
Care: The BZP (Bright Zinc Plated) finish provides good corrosion resistance. For extended outdoor use or exposure to harsh chemicals, consider additional protective measures such as applying a sealant or choosing stainless steel alternatives. Clean with a dry or slightly damp cloth to remove dust. Avoid abrasive cleaners that could damage the protective coating.
