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China Cross Flange Self Tapping Screw Suppliers - Quality Factory Direct Pricing and Fast Delivery
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China Cross Flange Self Tapping Screw Suppliers - Quality Factory Direct Pricing and Fast Delivery
Discover competitive EXW pricing directly from China’s leading suppliers. Our minimum order quantity is 2 tons, ensuring you get the best value for your needs. We provide packaging options in bags or boxes with pallets, guaranteeing safe transport of products. You can choose from major ports including Tianjin, Qingdao, Shanghai, or Ningbo for shipment. Delivery times range from 5 to 30 days depending on order quantity. We accept various payment methods such as T/T and LC, catering to your financial preferences. Our factory is capable of supplying up to 500 tons per month, making us your reliable partner for high-quality products in bulk.
Carbon Steel: Low cost, high strength; surface requires rust prevention treatment, such as galvanizing and Dacromet.
Stainless Steel (304/316): Strong corrosion resistance, suitable for humid or chemical environments.
Aluminum Alloy / Copper: Lightweight or conductive demand scenarios, but with lower strength.
Surface Treatment
Galvanization: Divided into electroplating (blue and white zinc, color zinc) and hot-dip galvanizing; generally rust resistant, suitable for indoor environments.
Dacromet (Zinc Chromium Coating): No risk of hydrogen embrittlement, high temperature resistance, corrosion resistance; used in automobiles and outdoors.
Phosphating: Increases lubricity and reduces installation friction.
Nylon Coating: Insulation, anti-loosening; commonly used in electronic devices.
Application Fields
Automotive Manufacturing: Sheet metal parts, interior panels, and wiring harness fixation — must be shock resistant and anti-loose.
Electronic Appliances: Circuit board and shell assembly; mainly small size (M2–M4) to avoid conductive interference.
Architectural Decoration: Installation of color steel plates, aluminum alloy doors and windows, and protection of flange surfaces from scratches.
Mechanical Equipment: Panels and enclosures fixed to withstand vibration environments.
Specifications and Standards
Common Specifications
Nominal Diameter: M2 to M12 (commonly M4–M6).
Length Range: 6mm to 100mm, depending on application requirements.
Flange Diameter: Usually 2–3 times the diameter of the screw.
International Standards
National Standard: GB/T 15856.4 (Pan head cross flange self-tapping screws).
German Standard: DIN 7500 (Technical standard for self-tapping screws).
American Standards: ANSI/ASME B18.6.4, SAE J78 (automotive applications).
Frequently Asked Questions
What is the difference between electroplated galvanizing and hot-dip galvanizing on flange screws?
Electroplated galvanizing produces a thinner, more uniform coating suitable for indoor applications. Hot-dip galvanizing creates a thicker zinc layer, offering superior corrosion protection for outdoor and heavy-duty environments.
Which material is best for flange screws used in humid or chemical environments?
Stainless steel grades 304 or 316 are recommended due to their strong corrosion resistance. Grade 316 is ideal for marine or industrial chemical settings.
What size flange screws are most commonly used in automotive manufacturing?
Flange screws in the M4–M8 range are most common. They typically follow SAE J78 or ANSI standards and often feature Dacromet coating for vibration and corrosion resistance.
What is Dacromet coating and why is it preferred for outdoor applications?
Dacromet is a zinc chromium coating that provides excellent corrosion resistance without hydrogen embrittlement risks. It handles high temperatures well, making it perfect for outdoor and automotive use.
What international standards apply to flange self-tapping screws?
Common standards include GB/T 15856.4, DIN 7500, and ANSI/ASME B18.6.4. These ensure consistent quality and performance across different industrial applications.
What is the minimum order quantity and typical supply capacity?
The minimum order quantity is 100 pieces, and the supply capacity reaches up to 10,000 pieces per month, ensuring reliable availability for both small and large-scale projects.
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