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The Range£9.47Visit shop Unifix Grade 8.8 Ht Hexagon Bolts Din 931 Bzp - M12 X 120 - &Mhb12 120 081 - Box Of 25 - Grey
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This guide is for professionals in construction and engineering who require robust fastening solutions. The Unifix Hexagonal Bolt offers high tensile strength and excellent corrosion resistance for demanding applications. Please note, these bolts are not approved for safety-critical applications.
| Colour | Silver |
|---|---|
| Model Part Number | M12 X 120 |
| Brand | Unifix |
Grade 8.8 indicates the bolt's tensile strength and hardness. It signifies a minimum tensile strength of 800 MPa and a minimum yield strength of 640 MPa, signifying high strength for general engineering applications.
BZP stands for Bright Zinc Plated. This is a protective coating applied to steel to enhance its resistance to corrosion and provide a bright, metallic appearance. The 5-micron thickness and CR3+ standard ensure good corrosion resistance for typical environments.
Yes, the BZP finish provides good corrosion resistance suitable for many outdoor applications. However, for extremely harsh or coastal environments, alternative materials like stainless steel might be more appropriate for long-term durability.
The recommended torque varies based on the specific application, lubrication, and joint materials. For a general guideline, tightening to a torque of approximately 70-90 Nm is common, but always consult engineering specifications or a torque chart for precise requirements.
No, these bolts are explicitly not approved for safety-critical applications. For primary structural components in buildings, bolts specifically certified for such use and often with higher grades or different materials are required.
Store bolts in a cool, dry place, away from moisture and corrosive substances. Keeping them in their original packaging or a sealed container can help maintain the protective coating.
The length specified is 120mm. This measurement typically refers to the length from the underside of the head to the end of the bolt.
Check that the hole or nut is clean and has the correct M12 thread. Ensure the bolt is aligned correctly and not cross-threaded.
Use the correct size wrench. Ensure the wrench is fully seated on the bolt head. Apply steady, controlled torque. If the head is already damaged, the bolt must be replaced.
Verify that the correct torque has been applied. Ensure the materials being joined are adequately strong for the load. Check for thread damage in the nut or tapped hole.
The BZP finish offers protection, but prolonged exposure to harsh conditions can lead to surface rust. Ensure proper storage and consider using stainless steel bolts for highly corrosive environments.
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