| Product | Hexagon flange bolt |
| Size | M5-M20 |
| Grade | 4.8; 8.8; 10.9; 12.9; etc.
ASME&AISI: 2; 5; 8 |
| Material | stainless steel, carbon steel |
| Surface treatment | Zinc plated, hot dip galvanized, black, Dacromet, etc. |
| Standard | DIN GB ISO JIS BA ASME ANSI ASTM |
| Thread | unc, unf, metric thread |
| Usage | building industry machinery |
| Certification | ISO9001, SGS, CTI, ROHS |
A flange bolt is a type of fastener consisting of a hexagonal head, a flange plate (with a gasket fixed to the hexagon below), and a screw (a cylindrical body with external threads). It needs to be used in conjunction with a nut to securely connect two parts with through holes. This type of connection is called a bolt connection, and by unscrewing the nut from the bolt, the two parts can be separated, making the bolt connection a detachable connection. Flange bolts are widely used in highway and railway bridges, as well as in heavy machinery such as industrial and civil buildings, cranes, and excavators, with a wide range of applications.
The classification of flange bolts includes:
Hexagonal flange types: There are two types of hexagonal heads, one is flat headed and the other is concave headed.
Surface color categories: Depending on different needs, the surface can be plated with white, military green, colored yellow, and rust free Dacromet.
Flange category: Depending on the location where the flange bolts are used, the size requirements for the disc vary. There are also flat bottomed and toothed types, with toothed ones providing anti slip function.
According to the force distribution method of the connection, it can be divided into ordinary and those with hinged holes. The flange bolts used for hinged holes should match the size of the hole and be used when subjected to lateral forces.
In addition, in order to meet the needs of locking after installation, some flange bolt shafts have holes that can prevent the bolts from loosening when subjected to vibration. Some flange bolts without threads need to be made thin, called thin rod flange bolts, which are beneficial for connecting under variable forces. There are specialized high-strength bolts on the steel structure, with larger heads and varying sizes.
The material classification of flange bolts includes high carbon steel, medium carbon steel, low carbon steel, and alloy steel, and suitable materials are selected according to different application scenarios and performance requirements. The fastening method and requirements for flange screws include the use of torque free ring wrenches or impact wrenches, selected according to the screw size and flange pressure rating to ensure the safety and reliability of the fastening
The use of flange bolts is very extensive, mainly used to fasten and connect two parts with through holes. This type of bolt consists of three parts: a hexagonal head, a flange, and a screw. It usually needs to be used in conjunction with a nut and is a detachable connection. Flange bolts have applications in various fields, including but not limited to the following aspects:
1.Industrial and civil buildings: In the field of construction, flange bolts are used to fix various building components such as beams, slabs, columns, etc., ensuring the stability and safety of the building structure.
2.Heavy Machinery: In the field of heavy machinery, such as cranes, excavators, etc., flange bolts are used to connect various components to ensure stable operation of the equipment.
3.Transportation: In the field of transportation, such as railways, bridges, vehicles, etc., flange bolts are used to fix and connect various components, ensuring the safety and reliability of transportation vehicles.
4.Aviation industry: In the aviation industry, flange bolts are used to connect aircraft structural components, withstand extreme temperature changes, vibrations, and aerodynamic loads caused by high-speed flight, and ensure flight safety.
5.Shipbuilding: In shipbuilding, flange bolts are used to connect ship structures, deck equipment, etc., meeting the requirements for corrosion resistance in marine environments.
6.Petrochemical industry: In the petrochemical industry, flange bolts are used to connect pipelines and their accessories, withstand high pressure and have excellent corrosion resistance, ensuring the safe and efficient operation of transportation systems.
In addition, there are various classifications for flange bolts, including hexagonal head types (flat head and concave head), surface color categories (such as white plating, military green, etc.), flange plate categories (flat bottom and toothed), and classifications based on the force distribution of the connection. These classifications enable flange bolts to adapt to different usage requirements and environmental conditions.
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