Hex Washer Head Self-Drilling Screw With EPDM

DIN7504K Hex Head Self Drilling Screws with Neoprene Rubber EPDM Bonded Washer – High-Performance Fasteners for Industrial and Construction Applications

Engineered for durability, efficiency, and superior sealing performance, the DIN7504K hex head self-drilling screw with EPDM bonded washer is a premium fastening solution designed for demanding structural and roofing applications worldwide. These screws combine precision engineering with corrosion-resistant materials to deliver long-term reliability across diverse climates—from arid deserts to coastal environments. Ideal for both commercial and residential projects, this product meets international standards including DIN, ISO, and GB specifications, ensuring compatibility with global construction practices.

Featuring a hardened drill point that eliminates the need for pre-drilled pilot holes, these fasteners significantly reduce installation time while minimizing labor costs. The integrated EPDM (Ethylene Propylene Diene Monomer) rubber washer provides excellent waterproofing, vibration damping, and thermal expansion compensation—making them especially effective in metal roofing systems where weather resistance and structural integrity are critical. Available in stainless steel grades such as SS304, SS316, A2, and A4, these screws offer exceptional resistance to rust, chemical exposure, and extreme temperatures, making them suitable for use in marine, industrial, agricultural, and infrastructure settings.

Key features include a wide diameter range from M2 to M64 (1/4” to 2”), customizable lengths, and high tensile strength ideal for heavy-duty assembly tasks. Whether you're constructing carports, warehouses, or modular buildings, these fasteners ensure secure anchoring without compromising material integrity. Their robust design supports rapid deployment in cold or hot climates, maintaining consistent torque performance even under fluctuating environmental conditions.

Common applications span across building envelope systems like corrugated metal roofing, panel-to-panel connections in prefabricated structures, garage door installations, electrical enclosures, and outdoor equipment mounting. They are widely used by contractors in regions such as Europe, South America, Southeast Asia, the Middle East, Africa, and North America due to their proven track record in harsh environments. With monthly production capacity of up to 500 metric tons and a minimum order quantity of 1 ton, this product offers scalability for both small-scale renovations and large-scale developments.

Users consistently praise the ease of installation, reliable sealing properties, and minimal maintenance requirements. Many report reduced project timelines and fewer callbacks related to leakage or loosening over time—a testament to the quality of the EPDM washer integration and the precision threading of the screw body. Professionals also appreciate the clean finish and professional appearance post-installation, which enhances aesthetic outcomes in visible architectural elements.

Manufactured under ISO9001:2008 certified processes, each batch undergoes rigorous testing for dimensional accuracy, mechanical strength, and surface finish. Custom packaging options are available to meet specific client needs, whether in boxes, cartons, or palletized units. Delivery typically occurs within 30 days per container, with lead times ranging from 15 to 20 working days depending on order volume. Payment terms include T/T with a 30% deposit and balance against shipping documents, or LC at sight, supporting flexible trade arrangements globally.

Frequently asked questions often revolve around material suitability for saltwater exposure, compatibility with aluminum substrates, and optimal torque values for different thicknesses of sheet metal. In response, manufacturers recommend using SS316 or A4 grade fasteners when installing in coastal areas or chemical processing facilities. For thinner gauge metals, it's advised to verify the drill point’s penetration depth before final tightening to avoid stripping threads. Proper storage in dry conditions will further extend shelf life and maintain performance characteristics over extended periods.

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