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Hex Head Stainless Steel Self-Tapping Screw

Specification: ST4.8 × 20 / ST5.5 × 25 / ST5.5 × 32 / ST5.5 × 45
Grade: A4-70

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Hex Head Stainless Steel Self-Tapping Screw Featured Image
  • SUS 304 / 316 Stainless Steel

    Material Grade

  • Hexagonal with EPDM Washer

    Head Type

  • Up to 12mm Steel Thickness

    Drilling Capacity

  • 2-3 Weeks

    Lead Time

  • C4-C5 High Durability

    Corrosion Resistance

Introduction

High-Performance Facade Fasteners

Our Hex Head Stainless Steel Self-Tapping Screws are specifically designed for the rigorous demands of curtain wall engineering. Featuring a self-drilling point and integrated EPDM sealing washers, these fasteners ensure a watertight, vibration-resistant connection between aluminum profiles and steel substructures.

Benefits

Why Choose Our Stainless Steel Fasteners

  • Superior Atmospheric Corrosion Resistance

    Manufactured from premium 304 or 316 grade stainless steel to prevent rust and staining in coastal or industrial environments.

  • Integrated EPDM Weather Sealing

    Each screw includes a high-density EPDM washer that creates a permanent waterproof seal, essential for external facade integrity.

  • Optimized Torque and Drive Stability

    The hexagonal head design allows for high torque application without stripping, ensuring a secure and efficient installation process.

  • High Load-Bearing Shear Strength

    Engineered to withstand significant wind loads and thermal expansion stresses common in large-scale curtain wall systems.

Standard

Technical Standards and Customization

Our fasteners are available in a wide range of diameters (M4.2 to M6.3) and lengths (19mm to 150mm) to accommodate various insulation thicknesses and profile depths. All screws comply with DIN 7504 and ISO standards for self-drilling tapping screws.

Custom finishes including Ruspert coating or color-matched powder coating for the hex heads are available to ensure the fasteners blend seamlessly with the architectural facade panels.

Applications

Related Applications

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FAQS

Frequently Asked Questions

Technical guidance on selecting and installing our stainless steel self-tapping screws for facade projects.

Can these screws be used with galvanized steel substructures?
Yes, but we recommend using 304/316 stainless steel with a protective coating or isolation washer to prevent galvanic corrosion between dissimilar metals.
What is the maximum thickness these screws can penetrate?
Depending on the drill point size (No. 3 to No. 5), they can effectively penetrate steel thicknesses ranging from 3mm to 12mm.
Are the EPDM washers UV resistant?
Yes, our washers are made from high-grade EPDM designed to withstand prolonged UV exposure and extreme temperature fluctuations without cracking.
Do you provide pull-out and shear test reports?
Detailed technical data sheets and laboratory test reports for tension and shear strength are available upon request for project engineering calculations.
What drive tool is required for installation?
A standard hexagonal socket drive is required; the size depends on the screw diameter (typically 8mm or 10mm AF).
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