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China Cross Flange Self Tapping Screws - Reliable Suppliers from Factory | Min Order 2 Tons
| FOB Price | US $0.5 – 9,999 / Piece |
| Min. Order Quantity | 100 Piece/Pieces |
| Supply Ability | 10,000 Piece/Pieces per Month |
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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.
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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.
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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 (China)
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).
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Frequently Asked Questions
Q
What is the difference between galvanized and Dacromet surface treatments on flange screws?
Galvanized screws use either electroplating (blue/white zinc or color zinc) or hot-dip processes to provide general rust resistance, making them suitable for indoor environments. Dacromet (zinc chromium coating) delivers superior corrosion resistance, withstands higher temperatures, and eliminates the risk of hydrogen embrittlement, making it the preferred choice for automotive components and outdoor applications.
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Which material is best suited for humid or chemically aggressive environments?
Stainless steel grades 304 or 316 are the recommended choice for humid or chemically aggressive environments due to their strong corrosion resistance. Grade 316 offers even greater resistance to chlorides and is especially preferred for marine, industrial, or chemical processing applications where long-term exposure is expected.
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What screw sizes are commonly used for PCB and electronic appliance assembly?
For circuit board and electronic appliance assembly, flange self-tapping screws in the M2–M4 diameter range are most commonly used. Their compact size is well-suited to tight enclosures and PCB mounting points, while also minimizing any risk of conductive interference with nearby electronic components.
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What international standards do flange self-tapping screws comply with?
Flange self-tapping screws are manufactured in accordance with several international standards: China's GB/T 15856.4 (pan head cross flange self-tapping screws), Germany's DIN 7500 (technical standard for self-tapping screws), and the U.S. standards ANSI/ASME B18.6.4 and SAE J78 specifically covering automotive applications. Compliance with these standards ensures consistent dimensional accuracy and performance reliability.
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What is the minimum order quantity and available monthly supply capacity?
The minimum order quantity is 100 pieces per order, with a monthly supply capacity of 10,000 pieces. This allows us to accommodate both small sample orders and high-volume production requirements. FOB pricing ranges from US $0.5 to $9,999 per piece, varying by specification, material, and order volume. Please contact us for a detailed quotation tailored to your needs.
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How does nylon coating on flange screws prevent loosening in electronic devices?
Nylon-coated flange screws provide both electrical insulation and vibration resistance. The nylon patch adds friction against the mating thread during tightening, which resists loosening caused by vibration or thermal expansion and contraction cycles. At the same time, the non-conductive nylon coating acts as a barrier that protects sensitive electronic components from accidental short circuits caused by direct contact with the metal screw body.