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This guide is for builders, DIY enthusiasts, and maintenance professionals seeking durable and reliable fastening solutions. The Unifix Grade 4.8 Cup Square Hex Bolts and Nuts offer exceptional strength and corrosion resistance for construction and repair projects, ensuring a secure hold. A key consideration is their specific size (M12 x 300mm), which may require verification for suitability in all applications.
| Colour | Silver |
|---|---|
| Model Part Number | 5014196472997 |
| Brand | Unifix |
Grade 4.8 indicates the mechanical properties of the steel. '4' refers to the nominal minimum tensile strength (400 MPa), and '.8' refers to the nominal minimum yield strength (0.8 times the tensile strength).
The cup square head is designed to seat into the material being fastened. The square shoulders lock into the material, preventing the bolt from rotating when the nut is tightened. This allows for single-handed tightening and provides a clean, flush finish.
Yes, Grade 4.8 bolts are designed for load-bearing applications. Always ensure they are appropriately sized and installed according to project requirements and relevant building codes.
You can typically clean the BZP finish with a damp cloth and mild soap if necessary. Avoid abrasive cleaners that could damage the plating.
Yes, the Bright Zinc Plating provides corrosion resistance suitable for many outdoor applications. However, in very harsh or continuously wet environments, their lifespan may be reduced compared to stainless steel.
You will need a spanner or wrench that fits the M12 nut. The bolt head usually doesn't require a tool as it's held in place by the material.
The M12 x 300mm size is quite long and best suited for joining thicker materials or where a significant grip length is required. For thin materials, shorter bolts would be more appropriate.
Ensure the square shoulders of the cup head are properly seated into the material. The material must be firm enough to prevent the head from turning. If using on soft material, consider a backing washer or pre-drilling a square recess.
Check for cross-threading or damage to the bolt threads. Ensure the nut is correctly aligned with the bolt. Clean any debris from the threads.
Verify the required bolt length for your material thickness before installation. This product is specifically M12 x 300mm; ensure it matches your project needs.
The Bright Zinc Plating offers good but not unlimited corrosion resistance. For very damp or coastal environments, additional protective measures might be needed, or a stainless steel alternative should be considered.
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