M12 x 70mm Coach Screw A4 Stainless Steel DIN 571

Heavy duty woodscrew

Manufactured from marine grade A4 stainless steel for exceptional corrosion resistance, making them ideal for both internal and external applications, including marine environments.

Combined with a hex head for installation with a range of conventional tools, and a thick coarse thread for high pull out resistance. This sees these heavy duty woodscrews widely used by professionals and DIY enthusiasts alike.

Specifically designed for timber applications where a reliable and strong hold is needed every time.

M12 coach screw specification:

• Thread Diameter (TD): M12 - 12mm
• Length (L): 70mm
• Thread Length (TL): 42mm
  
• Head Width (H): 19mm
• Conformity: DIN 571 Standards
• Material: Corrosion Resistant A4 Stainless Steel

The M12 coach screw is part of a larger range of coach screws available at great prices.

FAQs about stainless steel coach screws

What are hex head coach screws used for?

Hex head coach screws are heavy-duty screws designed for securing timber to timber, or timber to metal. The heavy-duty nature of the coach screw sees them commonly used in decking, fencing, roofing, and heavy joinery applications. The hexagonal head allows for higher torque using a spanner or socket for a firm, reliable hold.

How are coach screws different from coach bolts?

A coach screw had a pointed tip more like traditional screws and threads directly into wood without a nut. A coach bolt (also called a carriage bolt) has a flat tip, is used with a pre-drilled hole, and passes through the material being secured on the other side with a nut.

Can I use coach screws outside?

Yes, these stainless-steel coach screws are manufactured in A4 stainless steel which offers a very high corrosion resistance, including in salt water environments.

Do I need to drill a pilot hole first?

Yes, with the heavy-duty nature of the coach screw, always pre-drill a pilot hole before installation.

Should I use a washer under the head?

It’s good practice to use a flat washer beneath the hex head as this spreads the load across a wider area and protects the timber surface.

Which material should I choose - BZP, A2, or A4 stainless steel?

The coach screws at Fusion Fixings are available in 3 material types which cover a large range of applications.

BZP (Bright Zinc Plated): Ideal for indoor use or dry conditions.
A2 Stainless Steel: Great for outdoor projects such as fences or decking.
A4 Stainless Steel: Marine-grade corrosion resistance and the best choice for coastal or highly corrosive environments.

Can I use coach screws in brick, block, or concrete?

Coach screws are primarily for timber; however, they can be used in masonry for certain applications if combined with a suitable wall plug or anchor.

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