M8 Coach Screws

Our stainless steel M8 coach screws come in various lengths and are manufactured from A2 stainless steel, perfect for exterior and interior fastening. M8 coach screws (DIN 571) have an 8mm thread diameter and a hex head which is tightened with a 13mm socket or spanner. They feature a self-tapping thread, although a pilot hole is always recommended for maximum grip. Stainless steel M8 coach screws are a commonly used size by DIYers as well as trade professionals.

M8 Coach Screw Dimensions

  • Thread Diameter: 8mm
  • Socket Size: 13mm
  • Head Height: 5.55mm
  • Head Type: Hexagon
  • Specification: DIN 571

8mm Coach Screws in Stainless Steel

Also known as an M8 lag screw or an M8 lag bolt, these screws have a diverse range of uses. They are commonly used with timber, but can also be found connecting heavy timber, metal, or even in masonry projects.

For the next size up, try M10 coach screws. If you're looking for smaller than 8mm, try M6 coach screws.

Alternatively, you can shop our full range stainless steel coach screws here. 

Not what you were looking for? Find M8 coach bolts DIN 603 here. 

12 products


M8 Coach Screws – Stainless Steel (DIN 571 Hex Head) | Fixabolt®

Built for timber. Trusted by trades.

Fixabolt® M8 coach screws are heavy-duty timber fixings with a hex head and coarse thread, designed for structural and outdoor applications. Manufactured to DIN 571, these 8mm stainless steel screws are ideal for fixing into timber or masonry (with wall plugs), offering excellent holding power and long-lasting corrosion resistance.

Easy to install with a socket, spanner, or impact driver, M8 coach screws are widely used in fencing, landscaping, timber framing, and exterior joinery, anywhere where strength and simplicity matter.

Product Specifications

  • Size: M8 (8mm diameter)
  • DIN 571 - hex head, part-threaded, self-tapping for timber
  • Hex head – tighten with socket or spanner
  • Sizes: From 60mm to 200mm

Each screw features a sharp point and deep thread for strong bite and smooth installation.

Where M8 Coach Screws Are Used

Fixabolt® 8mm coach screws are ideal for:

  • Securing fence posts and wall plates
  • Timber-to-timber or timber-to-wall fixings
  • Outdoor structures like pergolas, sheds, and sleepers
  • Heavy-duty joinery and landscaping frames
  • Installing brackets, plates, or metal hardware into timber

Pre-drill a pilot hole, especially in hardwoods or when used with wall plugs, for the best performance.

Why Use Fixabolt® Coach Screws?

✔ Durable stainless steel fixings for outdoor conditions

✔ Fully compliant with DIN 571 standard

✔ Trusted by UK builders, joiners, and landscapers

✔ Bulk order discounts available

✔ Fast UK-wide tracked delivery

Need matching washers? Add them to your basket from the same page.

Simple. Strong. Stainless. Fix it with Fixabolt®.