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DIN 6921 Flange Bolts from China Suppliers - Durable & High-Performance Fasteners from Trusted Factory
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DIN 6921 Flange Bolts from China Suppliers - Durable & High-Performance Fasteners from Trusted Factory

Our high-quality flange bolts are available in various grades including 4.8, 8.8, 10.9, and 12.9, crafted from premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo. These flange bolts are designed for superior durability and performance. The surface treatments include options like blackened, electrogalvanized, Dacromet, hot-dip galvanized, and standard galvanized finishes to ensure resistance against corrosion and wear.

Flange bolts, manufactured by leading suppliers in China, feature a unique design that integrates a hexagonal head with a flange plate, providing a secure fit when used with nuts to tighten components over two through holes. For manufacturers seeking reliable fastening solutions, our factory produces flange bolts that meet stringent quality standards, making them ideal for a variety of 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 Category

    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?

    A flange bolt is an integral fastener consisting of a hexagonal head, a flange plate (which serves as a built-in gasket under the head), and a threaded screw. It is designed to connect parts through holes when paired with a nut.

    How are flange bolts classified by their surface treatment?

    Flange bolts are categorized by colors and coatings based on application needs, including white, military green, colored yellow, and corrosion-resistant Dacromet coatings.

    Why do some flange bolts have toothed flanges?

    Flange bolts can have flat bottoms or toothed bottoms. The toothed design provides an anti-slip function, enhancing grip and preventing loosening under vibration.

    What is the primary purpose and advantage of using flange bolts?

    Flange bolts have a higher support-area-to-stress-area ratio compared to standard bolts. This allows them to tolerate higher pre-tightening force and offer superior anti-loosening performance, making them ideal for automotive engines and heavy machinery.

    What are the standard replacements for GB5787 in the market?

    In the market, the commonly used national standard numbers GB5789 (large head) and GB16674 have replaced the older GB5787 (small head) standard.