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Cross Flange Self Tapping Screw - High-Quality China Factory Suppliers for Bulk Orders
| 💲 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; protects 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 approximately 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 minimum order quantity for flange self-tapping screws?
The minimum order quantity is 100 pieces per order. For bulk or custom orders, please contact us directly for pricing and lead time details.
Q
Which material is best for outdoor or high-humidity environments?
Stainless steel (304 or 316 grade) is highly recommended for outdoor or high-humidity environments due to its excellent corrosion resistance. Dacromet-coated carbon steel screws are also a cost-effective alternative for outdoor automotive applications.
Q
What sizes are available for flange self-tapping screws?
We offer nominal diameters from M2 to M12, with M4–M6 being the most commonly ordered sizes. Length options range from 6mm to 100mm to suit a wide variety of application requirements.
Q
What international standards do your screws comply with?
Our flange self-tapping screws comply with multiple international standards, including the Chinese National Standard GB/T 15856.4, German Standard DIN 7500, and American Standards ANSI/ASME B18.6.4 and SAE J78 for automotive applications.
Q
What surface treatments are available and how do I choose?
Available surface treatments include galvanization (electroplating or hot-dip), Dacromet coating, phosphating, and nylon coating. Choose galvanization for general indoor use, Dacromet for automotive or outdoor high-temperature environments, phosphating for reduced installation friction, and nylon coating for electronic insulation needs.
Q
Are flange self-tapping screws suitable for use in electronic devices?
Yes. For electronic appliances and circuit board assemblies, we recommend small-diameter screws (M2–M4) with nylon coating or non-conductive surface treatment to prevent conductive interference and ensure safe, reliable assembly.