Unifix Grade 10.9 Socket Button Head Screws - Silver

Discover the reliability of Unifix Grade 10.9 Socket Button Head Screws, designed to meet ISO 7380...

Best current price£5.58from OnBuy.com

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OnBuy.comUnifix Grade 10.9 Socket Button Head Screws M5 X 12 - Box Of 200 5014196334097
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The RangeUnifix Grade 10.9 Socket Button Head Screws M5 X 10 - Box Of 200 - Grey
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DebenhamsUnifix Unisex Silver Grade 10.9 Socket Button Head Screws - Box Of 200 In
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eBayUnifix Grade 10.9 Socket Button Head Screws M5 x 10 - Box of 200
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B&QB&Q - Grade 10.9 Socket Button Head Screws Iso 7380-1 BzpM5 X 10Box Of 200
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Product Information

Full details

The Unifix Grade 10.9 Socket Button Head Screws are an ideal fastening solution for engineers, hobbyists, and DIY enthusiasts who require high-tensile strength for demanding mechanical assemblies. These screws offer superior load-bearing capabilities and excellent corrosion resistance thanks to their Bright Zinc Plated (BZP) finish, making them reliable for long-term indoor and protected outdoor use. However, users should note that the M4 x 12 size is specific to certain clearance requirements and may not be suitable for heavy-duty structural wood applications where a larger thread diameter is required.

All features

ColourSilver
Model Part Number1263653
BrandUnifix

Extended Product Information

FAQs

What does Grade 10.9 mean?

Grade 10.9 indicates the mechanical property class of the steel, signifying a tensile strength of 1000 MPa and a yield strength of 900 MPa.

Can these be used outdoors?

They are suitable for sheltered outdoor use, but for high-exposure environments, stainless steel equivalents are recommended.

What is the thread pitch for these M4 screws?

These follow the standard ISO coarse thread pitch for M4, which is 0.7mm.

Do these screws come with matching nuts?

No, this product includes screws only. M4 nuts must be sourced separately.

Is the length of 12mm measured including the head?

No, per industry standards, the 12mm length refers to the length of the threaded shank under the head.

Troubleshooting

Screw head rounding out during installation

Ensure the hex key is fully seated in the socket and that it is the correct metric size. Avoid worn-out keys.

Screw feels loose after assembly

Check if the tapped hole is stripped or if the material thickness exceeds the screw's thread reach.

Visible surface rust

Although BZP-coated, the screws may oxidize in high-saline or high-humidity environments. If this occurs, clean with a wire brush and apply a rust-preventative spray.

Pros and Cons

Pros

  • High-tensile Grade 10.9 steel offers superior load capacity
  • Bright Zinc Plated finish resists rust and corrosion effectively
  • Socket button head design minimizes snags and provides a sleek look
  • Compliant with ISO 7380-1 standards for guaranteed compatibility
  • Bulk pack size reduces cost per unit for professional users

Cons

  • Requires a specific hex key size for installation
  • The 12mm length may be too short for thick material applications
  • Not intended for extreme outdoor environmental exposure without additional coatings

Setup, Compatibility & Care

Installation Steps:

  1. Ensure the mounting hole is drilled and tapped to an M4 thread standard.
  2. Align the components to be fastened, ensuring the surfaces are clean of debris.
  3. Insert the screw by hand for the first few turns to prevent cross-threading.
  4. Use a correctly sized hex key to tighten the screw until the head is flush against the surface. Do not over-torque, as this may strip the internal hex drive.

Care Instructions:

  • Keep the screws in their original box in a dry, low-humidity environment to preserve the BZP finish.
  • If using in environments prone to moisture, consider a light application of machine oil to the threads during installation.
  • Avoid using impact drivers that may damage the hex socket; prefer manual torque wrenches or hand-held drivers for precision.

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