2025.07.28 DD Fasteners – Engineering Resilience into Every Fastener

🔩 Product Overview

• Product Name:AS3566-Compliant Anti-Corrosion screws

• Application Standards: Compliant with Australian Standard AS3566, the industry benchmark for fasteners used in roofing and cladding

• Material Options:

  • Hardened Carbon Steel

  • Bi-metal for differential corrosion resistance

  • A2 / A4 Stainless Steel for maximum durability

• Available Heads & Drives: Hex Washer, Countersunk, Wafer Head | Hex, Phillips, Square

• Surface Coatings:

  • Ruspert®, Zinc Nickel, Mechanical Galvanizing, Class 3/4 organic coatings

  • Custom finishes available upon request

• Typical Sizes:

  • Diameter: M4.2 ~ M6.3 (#8 ~ #14)

  • Length: 16mm ~ 150mm (⅝” ~ 6”)

• Thread & Point Types: Hi-Lo Threads | Self-Drilling | Self-Tapping | Needle Point | Wing Tip

🛡️ Understanding the AS3566 Coating Classes: C1 – C4

Each coating class defines corrosion resistance levels under specific environmental exposures:

• C1 – Basic protection: For internal, dry environments or temporary applications.

• C2 – Moderate protection: For sheltered external use; limited coastal protection.

• C3 – High protection: For general exterior roofing and cladding in urban or industrial zones.

• C4 – Extreme protection: Specifically formulated for marine, industrial, and high-humidity environments.

At DD Fasteners, we offer compliant screws in Class 3 and Class 4, delivering long-term durability even in the harshest weather conditions.

⚙️ Key Features & Functional Advantages

• ✅ Certified Durability – All screws meet or exceed the performance requirements outlined in AS3566 Parts 1, 2, and 3 for mechanical strength, corrosion resistance, and weatherproof performance.

• ✅ Superior Coating Adhesion – Our coating technologies prevent flaking or premature corrosion during installation, especially when used in high-speed drills.

• ✅ Optimized Drive Stability – Drive heads are engineered for high torque transfer without cam-out, ensuring quick and safe installation.

• ✅ Leak-Resistant Sealing – Optional bonded EPDM washers provide a tight seal against moisture ingress, ideal for roofing and cladding applications.

• ✅ OEM Customization – Tailor the material, coating, dimensions, and packaging to suit your exact needs.

🏗️ Applications

DD Fasteners’ AS3566 standard screws are ideal for:

• Steel and timber roofing systems

• Pre-engineered building construction

• Metal cladding and wall panels

• HVAC and solar panel mounting

• Harsh industrial and marine environments

From residential roofing to large-scale commercial structures, our screws are designed to outlast the elements and outperform the ordinary.

🌍 Why Choose DD Fasteners?

With decades of experience supplying OEMs, distributors, and global contractors, DD Fasteners is a trusted partner known for precision engineering, rigorous quality control, and responsive customer service. Our commitment to certified fasteners ensures your projects are not only strong—but also fully compliant with international standards.

📞 Partner with Us Today

Get in touch for technical datasheets, samples, or to discuss tailored fastener solutions.

🌐 Visit: www.ddfasteners.com
📧 Email: felixyung@ddfasteners.com
📱 WhatsApp: +852 68409292

DD Fasteners – Engineered to Endure. Designed to Deliver.