How to Choose the Right DIN 571 Screw Size

Selecting the correct DIN 571 screw size is essential for ensuring safe installation, strong load-bearing capacity, and long-term structural stability. Whether you are working on woodworking projects, outdoor timber structures, or heavy-duty frames, choosing the right DIN 571 coach screw can significantly improve durability and reduce the risk of failure.

As a professional fastener manufacturer, Xinchi is glad to share how to choose the right DIN 571 by looking at diameter, length, material, and application requirements.

Understanding DIN 571 Screw Size Basics

Before choosing a specific size, it helps to understand how DIN 571 screw dimensions are defined. DIN 571 screws—also known as hex head wood screws or coach screws—use a simple notation based on diameter × length, such as M8 × 120 mm.
The diameter determines the screw’s strength, while the length affects penetration depth and pull-out resistance.

Common DIN 571 screw sizes include:

• Diameters: M6, M8, M10, M12
• Lengths: 40 mm to 300 mm

Understanding the meaning behind these numbers makes it easier to select the size that matches your structural requirements.

Selecting the Right DIN 571 Screw Diameter

The diameter of a DIN 571 screw is a critical factor because it directly affects load capacity and installation torque.
A larger diameter withstands higher pressure, making it suitable for heavier structures.

Typical usage suggestions:

• M6 – Light indoor woodworking and furniture
• M8 / M10 – Outdoor frames, fencing, medium-load structures
• M12 – Heavy timber construction and high-stress joints

A simple rule is:
Thicker wood and heavier loads require a larger DIN 571 screw diameter.

Choosing the Proper DIN 571 Screw Length

Length is just as important as diameter. A screw that is too short may not grip the wood securely, while one that is too long can penetrate through the material and cause safety risks.

General guideline:
A DIN 571 screw should penetrate at least twice its diameter into solid wood.

Examples:

• M8 → at least 16 mm of penetration
• M10 → at least 20 mm of penetration

For thicker beams, outdoor columns, or structural joints, longer screws—80 mm to 300 mm—are commonly used to ensure maximum holding power.

When fastening two pieces of wood, make sure the total length covers both the first board and the required anchoring depth in the second.

Material and Coating Options for DIN 571 Screws

Even if the size is correct, using the wrong material or coating can lead to corrosion, loosening, or premature failure.
Selecting the right material ensures the screw performs well in its intended environment.

Common options include:

• Zinc-Plated DIN 571 Screws
  Suitable for indoor, dry environments. Cost-effective for general woodworking.
• Hot-Dip Galvanized (HDG) DIN 571 Screws
  Designed for outdoor use. Provides a thick, long-lasting corrosion-resistant coating.
• Stainless Steel A2 / A4 DIN 571 Screws
  Ideal for coastal, humid, or chemical environments where maximum corrosion resistance is needed.

A practical rule:
The harsher the environment, the higher the required corrosion-resistance grade.

Application-Based DIN 571 Size Recommendations

Different projects require different DIN 571 screw sizes. Selecting the right combination of diameter and length prevents structural issues.

Practical recommendations:

• Indoor furniture / light wood panels
  M6 × 40–60 mm
• Outdoor frames, fences, wooden structures
  M8 or M10 in 80–150 mm lengths
• Heavy timber structures, beams, and load-bearing joints
  M10 or M12, often in 150–300 mm lengths

For long-term outdoor or structural projects, choose:
larger diameters + sufficient length + appropriate corrosion protection.

About Xinchi Fasteners Factory

Xinchi Fasteners is a specialized manufacturer focusing solely on fasteners, including DIN 571 screws, wood screws, self-tapping screws, machine screws, and customized non-standard parts. We do not produce chairs—our production capacity and quality control are dedicated entirely to the fastener industry.

Xinchi Fasteners Factory Advantages

• Strong Production Capacity
  Over 100 cold-heading machines with a daily output exceeding 10 million pieces.
• Strict Quality Control
  DIN 571 screws undergo hardness testing, torque testing, salt-spray testing, and coating thickness inspection.
• Wide Product Range
  Support for DIN 571, wood screws, self-tapping screws, machine screws, and OEM/ODM customized fasteners.
• Global Export Experience
  Stable shipments to Europe, the United States, Southeast Asia, and the Middle East.
• Reliable Packaging & Delivery
  Offers carton, pallet, color-box, and customizable packaging for distributors and wholesalers.

Xinchi is a trustworthy fastener company, especially in furniture nuts. We have a factory that was 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. Our products are widely used in automotive, machinery, construction, electronics, and furniture industries, trusted by global customers for stability, precision, and durability.