Hot Products
0102030405
DIN 6921 Flange Bolts by China Suppliers - Durable & High-Performance Factory Grade 4.8 to 12.9
Surface treatment process PRODUCTS
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
Hexagonal head type: One is flat headed, and the other is concave headed.
Surface color category: According to different needs, the surface is coated with white, military green, colored yellow, and corrosion-resistant Dacromet.
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.
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.
In addition, 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.
Frequently Asked Questions
What are the main components of a flange bolt?
A flange bolt consists of a hexagonal head, an integrated flange plate (acting as a fixed gasket), and a threaded screw rod.
What types of surface treatments are available for flange bolts?
They can be coated in various colors including white, military green, and yellow, or treated with Dacromet for superior corrosion resistance.
What is the advantage of using a toothed flange bolt?
Toothed flange bolts provide an enhanced anti-slip function, making them ideal for high-vibration environments where loosening must be prevented.
When should thin rod flange bolts be used?
Thin rod flange bolts are specifically designed for connections that are subjected to variable forces, providing better flexibility and connection stability.
Why are flange bolts preferred in automotive engines?
Because they offer a higher support-area-to-stress-area ratio, allowing for higher pre-tightening force and excellent anti-loosening performance.
What are the common standards for flange bolts?
Common national standards include GB5789 (large head) and GB16674, which are the standard replacements for the older GB5787 small head bolts.