DIN6921 large flange face bolts are a kind of bolts produced according to Chinese national standard GB5789, with a hexagonal head and a large flange face, this design helps to provide a larger support area when mating with the nut and reduces the pressure on the connecting parts.Dacromet is a special surface treatment technology that provides excellent corrosion resistance. Whereas hot dip galvanising is a process that forms a zinc layer on the surface of the bolt.The blue and white zinc layers are different coloured zinc layers formed during the galvanising process and provide excellent corrosion resistance. Strength grades 8.8, 10.9 and 12.9 indicate different strength levels of the bolts respectively, the higher the number, the higher the strength and load bearing capacity of the bolt .

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. Dacromet Coating: Provides excellent corrosion resistance and is suitable for harsh environments. 2. Hot-dip galvanising: blue and white zinc coating enhances the corrosion resistance of the bolt and extends its service life. 3. Large flange face design: helps to better distribute the load during fastening and reduce localised stress on the joint. 4. High strength grade: 8.8, 10.9, 12.9 and other different strength grade bolts can meet different load requirements. 5. Standardised production: in line with national standards, ensuring quality and interchangeability.

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. machinery and equipment: in machine manufacturing, used to fix machine parts, such as motors, pumps, etc. 3. Vehicle manufacturing: in the assembly of cars, trucks, rail vehicles, used to ensure a solid connection of components. 4. chemical and petroleum equipment: in the chemical and petroleum industry, used to connect and fix equipment such as pipelines, storage tanks, etc. 5. railway and motorway: used in the construction of railway and motorway infrastructure.