A2-304 Stainless Steel Coach Screws Hexagon Head DIN 571 - M6 x 70 - White

The A2-304 Stainless Steel Coach Screws with a Hexagon Head design conform to the DIN 571 standard...

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The RangeUnifix A2-304 Stainless Steel Coach Screws Hexagon Head Din 571 - M8 X 30 (Box Of 100) - White
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OnBuy.comA2-304 St/St Coach Screws Hexagon Head M8 X 40 - Box Of 100 5014196025858
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eBayA2-304 St/St Coach Screws Hex Head M8 x 30 Box of 100
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DebenhamsUnifix Unisex Silver A2-304 St/St Coach Screws Hexagon Head Din 571 - M6 X 70 - Box Of 100 In
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B&QB&Q - A2-304 St/st Coach Screws Hexagon Head M8 X 30Q205710000800030000Box Of 100
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Product Information

Full details

The Unifix A2-304 Stainless Steel Coach Screws with a Hexagon Head design are engineered for professional contractors and DIY enthusiasts who require high-strength, corrosion-resistant fastening for timber construction. These screws conform to the DIN 571 standard, providing reliable performance in structural wood applications; however, they require pre-drilling to prevent timber splitting during installation.

All features

ColourWhite
Model Part Number5014196320496
BrandUnifix

Extended Product Information

FAQs

What is the difference between A2 and A4 stainless steel?

A2 (304) is suitable for most outdoor applications. A4 (316) is 'marine grade' and recommended for high-salinity or coastal environments.

Do I need to pre-drill holes?

Yes, pre-drilling is highly recommended for coach screws to prevent splitting the timber and to ease the driving process.

Can these be used in masonry?

Yes, provided you use an appropriate sized wall plug to anchor the screw securely.

What does DIN 571 mean?

DIN 571 is a German industrial standard for hexagon head wood screws, ensuring uniform dimensions and thread patterns.

Can I use a standard screwdriver?

No, these screws require a socket wrench, spanner, or a hex-head driver bit for power tools.

Troubleshooting

Screw is difficult to drive into the wood

Ensure a proper pilot hole has been drilled; the pilot hole should be roughly the diameter of the screw core.

The screw head edges are rounding off

Verify that your socket tool is the correct metric size and is fully seated on the head before applying torque.

Wood splitting during installation

Increase the diameter of the pilot hole or ensure you are not fastening too close to the edge of the timber.

Pros and Cons

Pros

  • High resistance to rust and environmental degradation
  • Easy to drive using standard hand or power tools with hexagonal sockets
  • Compliant with industry-standard DIN 571 specifications
  • Provides a strong, secure grip in timber

Cons

  • Requires pilot hole drilling in most wood types to avoid splitting
  • Hexagonal head requires specific socket tools rather than standard screwdrivers
  • Not suitable for direct use in acidic wood species without proper preparation

Setup, Compatibility & Care

For optimal results, always measure the thickness of the material being fastened to ensure adequate thread engagement.

  1. Pilot Drilling: Use a drill bit slightly smaller than the shank diameter of the screw to ensure a snug fit while preventing wood fibers from splitting.
  2. Tool Selection: Use a high-quality hexagonal socket drive or a deep-well spanner to prevent rounding the edges of the screw head.
  3. Maintenance: While A2-304 stainless steel is highly resistant, it is not entirely immune to surface staining in extremely harsh, salt-heavy environments. Periodic inspection of structural joints is recommended for long-term safety.

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