Products Description
This high-performance composite flat washer screw is precision-manufactured from durable carbon steel, delivering exceptional tensile strength and structural integrity. The innovative composite washer integrates a galvanized steel shield with a premium EPDM rubber gasket, creating a highly effective waterproof seal that prevents leaks and rust formation.
Its self-drilling point ensures rapid, effortless penetration into steel and timber substrates, eliminating pre-drilling requirements. Featuring a hexagonal head for easy torque application, this fastener is widely used for securing roofing panels, metal sheets, and cladding.
Products Parameter
| Standard | DIN 7504K,ISO 15480, Non-standard customization |
| Material | Stainless steel304, Carbon steel |
| Head Type | Hex Flange Head |
| Thread Type | Self-tapping thread |
| Grade | Class 4.8 ,6.8 |
| Available Length Sizes | 13mm-150mm,Customized size |
| Surface Treatment |
ZY,YZ, Black |
Core Working Principle
Product Working Principle
This self-drilling screw operates through an integrated dual-action process. The hardened drill point first instantly penetrates steel and wood substrates without requiring pre-drilling, saving significant installation time. As the screw advances, the precision-engineered threads bite securely into the base material, drawing the hex flange downward. This downward force compresses the specialized composite washer.
The internal EPDM rubber gasket expands radially to fill all microscopic gaps around the shank. Consequently, this mechanism simultaneously provides a robust mechanical hold and a permanent waterproof barrier, effectively resisting moisture ingress, rust formation, and long-term loosening under vibration.
Main Application Fields
Metal Roofing and Color Steel Sheet Installation
Hardened self-drilling points penetrate steel sheets directly without pre-drilling, while compressed EPDM washers create a seal that completely eliminates rainwater leakage.
01
Steel Structure Factory Buildings and Framework Assembly
High-strength carbon steel paired with a hex flange distributes pressure; the fasteners withstand heavy loads and vibrations, ensuring long-term stability in industrial environments.
02
Coastal High-Humidity Areas and Exposed Outdoor Facilities
Dual protection-combining anti-corrosive galvanization with waterproof rubber gaskets-effectively resists salt spray and temperature fluctuations, protecting outdoor installations from rust and corrosion.
03
Container and Sheet Metal Assembly
Self-drilling points quickly engage thin-walled substrates,
while the wide flange surface accommodates thermal expansion and contraction, preventing stripped threads or cracking at connection points.
04
Packaging & Shipping
Standard packaging: Small box -> Carton -> Pallet
Customized packaging: Bulk packing, plastic bags, and boxes with the customer's logo are available.
MOQ: 1,000 PCS
Delivery time: 15–30 days
Shipping methods: Sea freight, air freight, or express delivery.
Need high-quality self-drilling screws for your upcoming project? Contact our expert team for free samples, competitive pricing, and professional technical support today.
Our address
No. 31, Huaxing Road, Dongmingyang Entrepreneurship Park, Linmingguan Town, Yongnian District, Handan, Hebei Province
Phone Number
FAQ
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