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China Suppliers DIN 6921 Flange Bolts - High-Performance Grade 4.8 to 12.9 from Quality Factory
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China Suppliers DIN 6921 Flange Bolts - High-Performance Grade 4.8 to 12.9 from Quality Factory

Discover high-quality flange bolts manufactured in China, available in various grades including 4.8, 8.8, 10.9, and 12.9. Our flange bolts are produced using premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo. We offer a comprehensive range of surface treatments including blackened, electrogalvanized, Dacromet, hot-dip galvanized, and galvanized options to ensure durability and resistance to corrosion.

As a leading flange bolt supplier and factory, we provide integrated bolts featuring a hexagonal head with a flange plate that includes a gasket below the hexagon and a cylindrical body with external threads. These bolts are designed to work in conjunction with nuts to securely fasten components through two connecting holes. Choose our flange bolts for reliable performance in various applications!

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    Product Detail

    Surface treatment process

    PRODUCTS
    xq (1)t03
    Flange bolt: A flange bolt is an integral bolt composed of a hexagonal head and a flange plate (the gasket below the hexagon and the hexagon are fixed together) and a screw (a cylindrical body with external threads). It needs to be matched with a nut and used to tighten the parts connecting two through holes. Therefore, bolt connection is a detachable connection.

    Classification

    PRODUCTS
    1. Hexagonal Head Type

    One is flat headed, and the other is concave headed.

    2. Surface Color Category

    According to different needs, the surface is coated with white, military green, colored yellow, and corrosion-resistant Dacromet.

    3. Category of Flange

    Depending on the location of the flange bolts used, the size requirements for the flange vary. There are also flat bottomed and toothed types, with toothed ones providing anti slip function.

    4. Force Distribution

    There are ordinary and hinged holes. The flange bolts used for hinged holes should match the size of the holes and be used when subjected to lateral forces.

    To meet the need for locking after installation, there are holes in the rod, which can prevent the bolt from loosening when subjected to vibration.
    Some flange bolts need to be made on the bare rod part without threads, called thin rod flange bolts. This type of flange bolt is beneficial for connecting under variable forces.
    Note: Commonly used national standard numbers in the market, GB5789 (large head) and GB16674 replace GB5787 (small head).

    Purpose

    PRODUCTS

    The flange bolt is composed of a hexagonal head and a flange plate, and its "support area to stress area ratio" is greater than that of ordinary bolts. Therefore, this type of bolt can withstand higher pre tightening force and has good anti loosening performance. Therefore, it is widely used in automotive engines, heavy machinery and other products.

    XQ (2)50d

    Frequently Asked Questions

    What is a flange bolt and how does it connect parts? ▶
    A flange bolt is an integral bolt consisting of a hexagonal head, a flange plate (where the gasket below the hexagon is fixed together), and a threaded screw. It is paired with a nut to secure and tighten connections between two parts through holes, offering a detachable connection.
    What surface treatments and colors are available for flange bolts? ▶
    Depending on the specific requirements, flange bolts can be coated in various surface colors, including white, military green, colored yellow, and corrosion-resistant Dacromet.
    How do flat bottomed and toothed flange categories differ? ▶
    Flange sizes differ depending on where the bolts are installed. They are classified into flat bottomed and toothed types. The toothed flange bolts provide a specialized anti-slip function to secure connections.
    Why are thin rod flange bolts used? ▶
    Thin rod flange bolts feature a bare, unthreaded rod section. This design is highly beneficial for securing connections that are subjected to variable forces.
    Why do flange bolts have better anti-loosening performance? ▶
    Because they combine a hexagonal head with an integrated flange plate, their "support area to stress area ratio" is larger than that of standard bolts. This allows them to support a higher pre-tightening force and provides excellent anti-loosening performance, making them ideal for automotive engines and heavy machinery.
    Which national standards replace GB5787 in the market? ▶
    In the market, the commonly used national standard numbers GB5789 (large head) and GB16674 are used to replace the GB5787 (small head) standard.