💰 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 requirements, specific pricing and lead times can be provided upon request.
Q Which material is best for outdoor or high-humidity environments?
Stainless steel (304 or 316 grade) is highly recommended for such environments due to its excellent corrosion resistance. Dacromet-coated carbon steel is a cost-effective alternative for outdoor automotive use.
Q What size ranges are available for these screws?
We provide nominal diameters from M2 to M12, with M4–M6 being the most standard. Lengths typically range from 6mm up to 100mm.
Q What international standards do the screws comply with?
Our products comply with several major standards, including GB/T 15856.4 (National), DIN 7500 (German), and ANSI/ASME B18.6.4 or SAE J78 (American).
Q How do I choose the right surface treatment?
Choose galvanization for indoor use, Dacromet for high-temperature or automotive outdoor needs, phosphating for easier installation, and nylon coating for electrical insulation.
Q Are these screws suitable for electronic appliances?
Yes, specifically small-diameter sizes (M2–M4) with nylon or non-conductive coatings are ideal for circuit boards and electronic shell assemblies to prevent interference.
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