China DIN 6921 Flange Bolts Suppliers - High-Quality Factory Direct Grade 4.8 to 12.9 for Durability and Performance
Surface treatment process
PRODUCTSFlange 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 According to the force distribution of the connection: 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.
Commonly used national standard numbers in the market, GB5789 (large head) and GB16674 replace GB5787 (small head).
Purpose
PRODUCTSThe 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.
