Flange bolt GB5787/DIN6921 refers to hexagonal head flange face bolts conforming to national standard GB5787 or German standard DIN6921. These bolts have a hexagonal head with a larger flange face, which is used to increase the contact area with the connected parts, thus improving the reliability of fastening. These bolts are commonly used in steel structures, mechanical equipment, vehicle manufacturing and other applications where high strength connections are required.

Material: including carbon steel, alloy steel, stainless steel (such as 304, 316, 316L, etc.) and other materials, the specific selection depends on the working environment and application requirements.

Grade: The product grade is divided into A grade and B grade, as well as different mechanical properties grade (such as 4.8 grade, 8.8 grade, 10.9 grade,A2-70, etc.), these grades reflect the tensile strength, yield strength and other mechanical properties of the bolt. Different grades are suitable for different load bearing requirements and working environments.

Advantage:

1. Increased contact area: The flange face design provides a larger contact area than normal bolts, which helps to reduce the pressure on the connected parts. 2. Anti-loosening performance: Due to the larger contact area, these bolts usually have better anti-loosening performance. 3. Ease of installation: the flange surface can provide better spanner contact, making installation and disassembly more convenient. 4. High load-bearing capacity: usually made of high-strength materials, able to withstand greater preload. 5. Corrosion resistance: depending on the material and surface treatment, these bolts can have good corrosion resistance.

Scope of 

application

1. Steel structure: In steel structures such as buildings and bridges, it is used for connecting and fixing components such as steel beams and steel plates. 2. Mechanical equipment: in mechanical manufacturing, used to fix machine parts, such as motors, pumps, and so on. 3. Vehicle manufacturing: in the assembly of cars, trucks, rail vehicles, used to ensure the solid connection of components. 4. Pressure vessel: used for connection and sealing in the manufacture of pressure vessels in chemical and petroleum industries. 5. Other high-strength connection needs: in any occasion where high load capacity and anti-loosening properties are required.