Self-Drilling Screws Manufacturer in China

DIN 7504 self-drilling screws, made to a catalog specification

WTFasteners — Hebei W.T Fasteners Co., Ltd. — produces self-drilling screws to the DIN 7504 series at its factory in Yongnian, Handan, China’s largest fastener production base. A self-drilling screw carries its own drill point, so it cuts its own pilot hole in steel sheet and light structural sections: no pre-drilling, one tool, one pass. That single-step installation is why roofing contractors, steel-structure fabricators and cladding installers buy them by the carton and by the container.

The cataloged range covers the four head styles buyers ask for most. Hex washer head screws — the workhorse of metal roofing — are listed with an EPDM bonded sealing washer that compresses under the head to keep rain out of the fixing point. Countersunk (CSK) head screws sit flush in the finished surface for trim and panel work. Wafer head screws give a low-profile, wide bearing surface for thin sheet and timber-to-steel connections, and pan head types cover general sheet-metal assembly. Each style is tied to a named DIN 7504 form in the 2026 catalog, so quotations start from a standard rather than a guess.

Sizes, lengths and corrosion-resistant finishes

Catalog sizes run #6, #7, #8, #10, #12 and #14 across the range. Listed lengths span 13–100 mm for CSK, wafer and pan head types, extending to 19–300 mm for combined washer head screws used in roofing and sandwich-panel build-ups. Because every combination of head, size and length is confirmed per inquiry, buyers can match an existing bill of materials or consolidate several line items into one factory order.

Finishes are where service life is decided. The catalog lists bright zinc plating and galvanized (G.I.) finishes for indoor and sheltered use, plus Dacromet and Ruspert coatings where higher corrosion resistance is required — coastal warehouses, agricultural buildings and export markets with humid climates. Tell us the exposure conditions and we will confirm the coating option that fits the application.

Where self-drilling screws are used

Typical applications include metal roofing and wall cladding, steel purlins and girts, sandwich and insulated panels, light-gauge steel framing, HVAC ducting and general sheet-metal fabrication. Distributors serving the construction sector usually stock the fast-moving hex washer head sizes with EPDM washers, while project buyers order mixed cartons matched to a take-off list. Packaging — bulk cartons, small boxes or private-label packing — is aligned before shipment.

How to request a quotation

Send the head style, size, length, finish, quantity, packing requirement and destination port or country. A reference photo or an existing sample helps when the exact style is unclear. Share a drawing or a non-standard requirement and we will review it against our production range: standard and custom fasteners are both part of the factory program.