2025.06.18 SUS304 A2 Self-Tapping Screws for Demanding Roofing Applications

Combining mechanical strength with excellent corrosion resistance, these self-tapping screws are ideal for direct installation into a wide range of materials—including aluminum, galvanized steel, and even softer base materials like timber and plastic—without requiring pre-drilling.

Product Specifications

• Product Name: SUS304 A2 Self-Tapping Screw

• Material: Austenitic Stainless Steel (AISI 304 / A2 Grade)

• Available Sizes:
  – Diameter: Ø3.5mm to Ø6.3mm (#6 to #14)
  – Length: 13mm to 100mm (1/2" to 4")

• Head Types: Pan head, CSK (countersunk), Hex washer head

• Drive Options: Phillips, Torx, Hex, Square

• Thread Style: Full thread / Partial thread / Hi-Lo thread

• Point Type: Sharp point / Type 17 (for timber)

• Surface Finish: Plain stainless or optional coatings (e.g. Teflon, black oxide)

• Standards: DIN, JIS, ANSI, ISO; customized to client drawings
  
  

Roofing Application Advantages

In roofing construction, where exposure to extreme weather, temperature fluctuations, and corrosive environments is constant, SUS304 A2 screws offer distinct advantages over conventional C1022A carbon steel screws:

• Superior Corrosion Resistance:
  AISI 304 stainless steel provides inherent protection against rust, oxidation, and degradation in coastal, industrial, or tropical climates—far outperforming zinc-plated C1022A screws in salt spray and outdoor exposure tests.

• No Coating Required:
  Unlike C1022A screws that rely heavily on coatings (e.g. zinc, Ruspert) for protection, SUS304 screws deliver consistent performance even when the surface is scratched or worn, reducing maintenance risks.

• Longer Lifespan:
  With superior tensile strength and corrosion resistance, the A2 self-tapping screws support longer service life in both metal and wood roofing structures, minimizing the risk of leaks, structural loosening, and costly replacements.

• Aesthetic Versatility:
  Available in plain silver finish or custom-coated (black, grey, bronze) to match architectural needs, the screws are ideal for visible applications like solar panel mounting, facade cladding, or decorative roofing profiles.
  
  

Key Functional Features

• Self-Tapping Capability: Cuts thread into substrate without pre-drilling, ensuring faster installation and stronger hold

• High Torsional Strength: Withstands torque during high-speed installation, minimizing breakage risk

• Thermal Stability: Non-brittle under temperature fluctuations, ideal for outdoor construction

• Low Maintenance: Suitable for long-term installations with minimal inspection or replacement

Trusted by Professionals Worldwide

DD Fasteners' SUS304 A2 Self-Tapping Screws are widely adopted across Europe, Australia, and Southeast Asia in roofing, facade systems, industrial cladding, HVAC units, and marine infrastructure. Architects, contractors, and OEM partners choose DD Fasteners for consistency, quality assurance, and global compliance.

Custom OEM Solutions Available

DD Fasteners supports customized production tailored to project-specific needs—including SUS316 marine-grade stainless, special dimensions, head styles, and packaging configurations. Our flexible manufacturing ensures compatibility with your engineering standards and industry specifications.

About DD Fasteners

With over 20 years of experience in fastener manufacturing, DD Fasteners delivers high-precision, high-performance solutions to customers in more than 120 countries worldwide. Our monthly production capacity exceeds 6,000 tons, supported by ISO-certified quality systems and international testing standards.

Get in Touch

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

DD Fasteners – Precision that Lasts. Strength you can Trust.