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Home > Hot Products > China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper
China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper
China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper
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China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper
China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper

China Suppliers Factory Yellow Zinc Plated Hex Flange Bolt DIN6921 - Carbon Steel, Alloy, Stainless, Brass, Copper

Discover premium quality fasteners directly from China with our exceptional range of products. Our FOB Price starts at just US $0.6 to $9.99 per piece, making it an affordable choice for bulk orders, with a minimum order quantity of 100 pieces. As one of the leading suppliers in the industry, we boast a supply ability of 10,000 pieces per month, ensuring we meet your urgent needs.

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Our fasteners undergo meticulous surface treatment options including Plain, Zinc Plated (ZP), Galvanized, Hot Dip Galvanized, and Dacromet, providing durability and resistance to corrosion. Manufactured from high-quality materials such as Carbon Steel, Alloy Steel, Stainless Steel, Brass, and Copper, our products conform to various standards including DIN, GB, UNC, BSW, and JIS.

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We take pride in our certifications, holding ISO9001, ISO14001, ISO45001, and SGS, affirming our commitment to quality and safety. Our fasteners are available in a variety of grades, including 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, and A4-80, catering to diverse industrial requirements. Choose our factory for reliable fastener solutions that meet your specifications and exceed your expectations.

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Product Description

Flange bolt, also known as flange bolt, is a special type of bolt with a flange surface (flange), widely used in situations that require high preload, anti-loosening, and sealing.
🛠️ Structural Characteristics
🔵 Flange Surface Design
There is an integral flange (circular gasket) below the bolt head, which increases the contact area, disperses pressure, and reduces damage to the connection surface.
🔧 Hexagonal or Twelve Pointed Head
Commonly designed as a hexagonal head, easy to tighten with standard tools. Some high-strength models use twelve corner heads.
⚙️ Anti-Slip Tooth Pattern
The flange surface of some flange bolts has radial tooth patterns to enhance friction and prevent loosening.
✅ Main Advantages
💡 No Need for Additional Gaskets
The integrated flange replaces traditional gaskets, simplifies installation steps, and reduces costs.
🛡️ Anti-Vibration & Anti-Loosening
The flange surface increases friction, and the tooth pattern design further prevents bolts from loosening in vibration environments.
⚖️ Uniform Force Distribution
The flange disperses the load, protects the surface of the connected parts, and avoids crushing or deformation.
🔒 Sealing Enhancement
When combined with flange surfaces and soft materials such as rubber gaskets, the sealing performance can be improved.
🏭 Common Application Areas
🚗 Automotive Industry
Key parts such as the engine, gearbox, and wheel hub are adapted to high vibration environments.
🏗️ Machinery Manufacturing
Heavy equipment, machine tools, pumps, valves, and other connections that require high preload force.
🏙️ Architecture & Steel Structures
Wind and earthquake resistant structures such as bridges, steel frames, curtain walls, etc.
🚆 Rail Transit
Scenarios with high requirements for safety and reliability, such as rail vehicles and signal equipment.
🧪 Material and Surface Treatment
🔩 Common Materials
  • Carbon steel (e.g. Grade 4.8, 8.8, 10.9)
  • Stainless steel (A2-304, A4-316, corrosion-resistant)
  • Alloy steel (high-strength or high-temperature resistant)
✨ Surface Treatment
  • Galvanized (conventional anti-corrosion)
  • Dacromet (high corrosion resistance)
  • Hot dip galvanizing (heavy-duty anti-corrosion)
  • Phosphating (enhancing wear resistance)
❓ Frequently Asked Questions
Q What is the difference between a flange bolt and a regular bolt?
A flange bolt features an integrated flange (washer-like ring) beneath the bolt head. This built-in flange increases the bearing surface area, eliminates the need for a separate washer, and provides better anti-loosening performance compared to standard bolts.
Q Do flange bolts require additional washers or gaskets?
In most cases, no. The integrated flange acts as a built-in washer, distributing the clamping load and reducing the need for additional gaskets. However, in specific sealing applications, a soft gasket (such as rubber) may still be used in combination.
Q What materials are flange bolts commonly made from?
Flange bolts are commonly manufactured from carbon steel (grades 4.8, 8.8, 10.9), stainless steel (A2-304 or A4-316 for corrosion resistance), and alloy steel for high-strength or high-temperature applications.
Q Why are flange bolts preferred in the automotive industry?
Flange bolts are widely used in automotive applications because their tooth-patterned flange surface significantly resists loosening under high vibration conditions, ensuring long-term joint reliability and safety in engines and wheel hubs.
Q Which surface treatment is best for outdoor use?
For outdoor or harsh environments, hot dip galvanizing or Dacromet coating is generally recommended. These treatments provide heavy-duty anti-corrosion protection superior to standard galvanizing.
Q Can flange bolts be used in structural engineering?
Yes. Their ability to distribute load evenly and resist loosening under dynamic forces makes them a reliable choice for wind and earthquake-resistant structures like bridges and steel frames.

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