DIN6921 Flange Bolts

Flange Bolt Product Describsion

Flange bolts are Befast Fastener’s main product. We are a manufacturer also a supplier of these bolts. While producing and supplying bolts, we also produce nuts, washers and other fastener products used in conjunction with them.

The flange bolts we produce are generally classified according to whether the material is carbon steel or stainless steel. More specific classifications are as follows:

Carbon steel flange bolts are generally classified according to strength levels. The more common strength levels are: 4.8, 8.8, 10.9, and 12.9. Among them, bolts with grade 8.8 or above are generally called high-strength bolts （high tensile bolts）.Stainless steel flange bolts are generally classified according to different materials. The more common stainless steel materials are SUS201 SUS304 SUS316

In addition to different materials and strengths, the biggest impact on flange bolts is surface treatment. The following are the more common surface treatments for these bolts: black oxide, black zinc, zinc plated (ZP), color zinc plating (CZP /YZP), hot dip galvanized (HDG), dacromet coating, etc.

Flange Bolt Production Process

Flange bolts are sent from the raw material line to the final product. They generally go through the following process:
Annealing of raw materials – pickling – drawing – forming – grinding – heat treatment – surface treatment – classification – packaging – shipping

The rough schematic diagram is as follows:

Flange Bolt Application fields

1. Automotive Industry: These bolts are commonly used in automotive applications for securing critical components such as engines, transmissions, suspension systems, and chassis components. They provide a secure and stable connection, especially in areas subject to high vibration and stress.
2. Construction and Structural Engineering: These bolts find extensive use in construction and structural engineering projects for connecting steel beams, columns, and other structural members. They are often used in conjunction with these nuts to provide a strong and reliable connection in buildings, bridges, and other infrastructure projects.
3. Machinery and Equipment Manufacturing: These bolts are essential in machinery and equipment manufacturing for assembling various components such as motors, gearboxes, pumps, and conveyors. They ensure proper alignment and stability, contributing to the efficient operation of industrial machinery and equipment.
4. Marine and Offshore Applications: These bolts are utilized in marine and offshore industries for securing equipment, machinery, and structural components on ships, offshore platforms, and marine structures. They are corrosion-resistant and provide reliable fastening solutions in harsh marine environments.
5. Railroad Infrastructure: These bolts are used in railroad infrastructure for securing rail tracks, switches, and signaling equipment. They provide a secure connection that can withstand the vibrations and stresses associated with railroad operations, ensuring the safety and reliability of railway systems.
6. HVAC (Heating, Ventilation, and Air Conditioning): In HVAC systems, these bolts are used for connecting ductwork, HVAC units, and other components. They ensure a tight seal and prevent air leaks, contributing to the efficiency and performance of HVAC installations in residential, commercial, and industrial buildings.
7. Power Generation: These bolts are employed in power generation facilities such as thermal power plants, hydroelectric dams, and wind farms for securing turbines, generators, and other equipment. They provide a reliable fastening solution in demanding environments where high temperatures, pressures, and vibrations are present.
8. Agricultural Machinery: These bolts find applications in agricultural machinery and equipment for securing components such as blades, axles, and chassis frames.