Roof screws DIN7504 are primary screws mainly used in metal sheets or roof panels. Tianjin Rio Tinto, as a professional screw manufacturer, we have our own production lines to produce general and customized products. We will control product quality at every step of production;

The main raw material is C1022A, and electro-galvanizing is widely used, which has good anti-corrosion ability and corrosion resistance. Dacromet, Rexiubao, stainless steel, etc. can also be produced according to customer needs;

Wholesale Hex Head Roofing Screws | Premium Leak-Proof Metal Fasteners

In industrial steel building construction, metal warehousing fabrications, and residential metal roofing installation, maintaining long-term joints against wind shear and heavy precipitation is critical. Our factory-direct hex head roofing screws (hex head self-drilling fasteners) are precision-engineered to provide rapid driving speeds, immense strip-out resistance, and an impenetrable weather-tight seal.

Advanced Metallurgical Engineering & Anti-Leak Structural Design

Manufactured from high-grade carbon steel (C1022A) or premium stainless steel (Bi-metal/SS304), our screws undergo a rigid case-hardening process. This advanced heat-treatment ensures an ultra-hard drill tip capable of penetrating heavy structural steel purlins while preserving core flexibility to prevent head-snapping under high installation torque.

Precision-Formed Tek Drill Points:Available in #3 and #5 drill points, our roofing fasteners drill, tap, and secure into structural steel profiles and cold-rolled purlins up to 12mm thickness in a single, high-speed stroke without requiring a pre-drilled pilot hole.

Premium Vulcanized EPDM Bonded Washers: The integrated dome-shaped metallic backing is vulcanized with a high-purity EPDM rubber lining. When compressed by the hex flange head, the rubber seals the penetration hole completely, absorbing thermal expansion and resisting ozone cracking from -40°C to 120°C.

Anti-Slipping Hex Flange Drive:Designed with a deep-stamped hex head that tightly fits standard magnetic sockets, minimizing drive slippage (cam-out) and preventing surface coating damage during high-volume contracting assembly.

 

Premium Anti-Corrosion Surface Coatings (DIN 7504K)

To combat diverse severe weather and chemical environments, we supply global distributors with verified specialized surface treatments passing strict salt-spray testing requirements:

Surface Finish Type

Salt Spray Rust Resistance

Primary Project Application Environment

Yellow/White Zinc Plated

24 Hours - 72 Hours

Standard interior framing, general-purpose dry enclosures.

Ruspert Coating (Multi-Layer)

500 Hours - 1500 Hours

Industrial chemical zones, coastal regions, acid rain exposure.

Mechanical Galvanized (Class 3/4)

Up to 1000 Hours

Premium heavy-duty exterior roofing, commercial steel infrastructure.

Global B2B Supply Chain & OEM Customization

As a leading hardware fastener manufacturer based in China, we streamline procurement processes for large-scale hardware importers, wholesalers, and private labels:

Tailored Structural Dimensions:Outer diameters ranging from #8 (4.2mm) up to #14 (6.3mm), with customizable extended lengths up to 200mm to accommodate insulated sandwich panels.

Heavy-Duty Seaworthy Packaging:Available in 25kg bulk industrial cartons, reinforced woven bags, or small customized retail boxes featuring your custom corporate logo and logistical barcodes.

 

Secure your structural roofing projects with verified factory-direct reliability. Contact our engineering sales desk today to request our latest B2B bulk price sheets, full dimensional catalogs, or free testing samples.

EPDM rubber gaskets are suitable for outdoor applications requiring weather resistance and water resistance. Not easy to open or crack;

Hex washer head tapping screws are primarily used in metal and wood applications. The thicknesses we can provide include #10(4.8mm), #12(5.5mm), #14(6.3mm). Length from 16mm-150mm. All screws are heat treated and have good hardness.

In addition, we can also provide free samples, customized packaging services, etc.