How to Choose the Right DIN 571 Hex Wood Screw Size for Your Project

For timber construction, outdoor decking, or heavy-duty furniture assembly, the DIN 571 hex wood screw is a reliable fastener known for its strong holding power and durability. Selecting the correct size is crucial for ensuring safety, stability, and efficient installation.

As a professional fastener supplier, XINCHI is pleased to share this DIN 571 size guide, which provides practical tips for selecting the right screw for your project.

DIN 571 Hex Wood Screw Size Range and Common Lengths

The DIN 571 hex wood screw is available in diameters from M4 to M16:

• M4–M5 – for light-duty applications such as small frames and furniture assembly
• M6–M8 – for medium-duty projects like timber structures and interior load-bearing parts
• M10–M16 – for heavy-duty use, such as securing beams, posts, and large outdoor structures

Lengths typically range from 25 mm to 300 mm. As a rule, the screw should penetrate at least two-thirds of the wood’s total thickness for a secure hold.

Choosing DIN 571 Hex Wood Screw Diameter and Length by Wood Thickness and Load

When deciding how to choose DIN 571 hex wood screw size, consider both wood thickness and load requirements:

• Thin wood / light loads (≤ 30 mm) – M4–M5, 25–50 mm length
• Standard timber / medium loads (30–70 mm) – M6–M8, 60–120 mm length
• Thick beams / heavy loads (≥ 70 mm) – M10–M16, 150–300 mm length

Choosing a screw that is too short will weaken the joint, while an excessively long screw can increase installation difficulty and cost.

Recommended Pilot Hole Diameters for DIN 571 Hex Wood Screw

To prevent wood splitting and make installation easier, pre-drill a pilot hole slightly smaller than the screw’s core diameter:

• M4 – 2.5–3.0 mm
• M6 – 4.0–4.5 mm
• M8 – 5.5–6.0 mm
• M10 – 7.0–8.0 mm

This allows the threads to grip firmly while reducing stress on the timber.

Using Washers and Nuts with DIN 571 Hex Wood Screw

The DIN 571 hex wood screw is generally installed directly into wood, but in softer timber or where you need to spread pressure, adding a flat washer under the hex head helps protect the surface.
When the screw passes completely through the timber, a washer and nut on the opposite side can provide extra clamping strength.

Xinchi Factory Advantages in Producing DIN 571 Hex Wood Screw

Xinchi Fasteners is a professional manufacturer with 102 cold heading machines and a daily output exceeding 10 million pieces. Our modern facility covers 30,000 square meters with two six-story buildings, enabling high-volume, consistent production. We strictly follow DIN standards, ensuring every DIN 571 hex wood screw meets the high expectations of our global clients.

Xinchi Fastener factory

XINCHI is a trustworthy fastener company, especially in furniture nuts. We have a factory,  founded in 2007. We are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier, XINCHI offers a wide range of high-quality fasteners, including nuts, screws, bolts, rivets, and washers. If you would like to learn more about fasteners or are interested in wholesale fasteners, please do not hesitate to contact us. Our experienced and expert service team will reply as soon as possible.