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Cross Flange Self Tapping Screws - Premium Quality from China Suppliers & Factory, Fast Delivery and Competitive Prices
| FOB Price | US $0.5 – 9,999 / Piece |
| Min. Order Quantity | 100 Piece/Pieces |
| Supply Ability | 10,000 Piece/Pieces per Month |
🔩 Materials and Surface Treatment
Common Materials
⚙️ 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 (e.g., M5 flange surface diameter of about 10–15mm).
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
Q What is the difference between electroplating and hot-dip galvanizing for flange self-tapping screws?
A Electroplating (blue/white zinc or color zinc) produces a thinner, uniform coating ideal for indoor or light-duty environments. Hot-dip galvanizing applies a much thicker coating, providing superior corrosion resistance for outdoor or harsh-condition applications.
Q Why is Dacromet preferred over standard galvanizing in automotive and outdoor use?
A Dacromet eliminates the hydrogen embrittlement risk that can occur with electroplating, and it offers significantly higher temperature and corrosion resistance. These properties make it the preferred surface treatment for automotive components and long-term outdoor fastener applications.
Q Which material is best for use in humid or chemically aggressive environments?
A Stainless steel 304 or 316 is the recommended choice. Grade 316 in particular provides excellent resistance to chlorides and chemicals, making it suitable for marine, food-processing, and chemical-industry environments.
Q What size flange self-tapping screws are most commonly used in electronics assembly?
A For electronic appliances and circuit board/shell assembly, sizes M2–M4 are most common. The small diameter minimizes material stress and avoids conductive interference. Nylon-coated variants are often used to add insulation and anti-loosening performance.
Q What international standards do these flange self-tapping screws comply with?
A These screws are produced in compliance with GB/T 15856.4 (Chinese national standard), DIN 7500 (German standard), and American standards ANSI/ASME B18.6.4 and SAE J78 for automotive applications. Custom compliance with additional standards is available upon request.
Q What is the minimum order quantity and how quickly can orders be fulfilled?
A The minimum order quantity is 100 pieces per order. With a monthly supply capacity of 10,000 pieces, both small prototype orders and large production runs can be accommodated. Contact us with your specifications for an accurate lead time quote.