Hexagon head flange bolts

The hexagonal flange bolt is a special type of bolt. The following will introduce it from aspects such as basic information, relevant standards, characteristics, and application fields:

Basic Information of the Hexagonal Flange Bolt

Structural Features: The hexagonal flange bolt is composed of two parts: a hexagonal head and a flange disc. There is a relatively large flange disc below the head of the bolt. The function of the flange disc is to increase the contact area between the bolt and the connected parts, thereby reducing the pressure per unit area and improving the stability and reliability of the connection.

Manufacturing Materials: It is usually manufactured from materials such as carbon steel, alloy steel, or stainless steel. The hexagonal flange bolt made of carbon steel has a relatively low cost and a certain degree of strength; the bolt made of alloy steel has higher strength and better toughness; the bolt made of stainless steel has excellent corrosion resistance and is suitable for harsh working environments.

Relevant Standards of the Hexagonal Flange Bolt

GB/T 5787-2016: It stipulates that the thread specifications of the hexagonal flange bolts are from M5 to M64, and the product grades are A and B. This standard makes detailed regulations on the dimensions, tolerances, mechanical properties, surface treatment, etc. of the bolts to ensure the quality and interchangeability of the bolts.

ISO 4161:2017: It is a standard for hexagonal flange bolts formulated by the International Organization for Standardization and is widely adopted internationally. Its content is similar to that of GB/T 5787-2016, and it standardizes various parameters and performance requirements of the bolts to promote international trade and product compatibility.

Characteristics of the Hexagonal Flange Bolt

Good Sealing Performance: Due to the presence of the flange disc, when the bolt is tightened, the flange disc will closely fit the surface of the connected parts, forming a good sealing effect, which can effectively prevent the leakage of liquids or gases. This feature makes the hexagonal flange bolt widely used in some occasions with high requirements for sealing performance, such as pipeline connections and pressure vessels.

High Load-bearing Capacity: The flange disc increases the contact area between the bolt and the connected parts, enabling the bolt to distribute the load more evenly when subjected to axial tensile force and transverse shear force, thereby improving the load-bearing capacity of the bolt. Compared with ordinary hexagonal head bolts, the hexagonal flange bolt can withstand greater external forces and is suitable for connection parts that need to transmit large loads.

Good Anti-loosening Performance: The friction between the flange disc of the hexagonal flange bolt and the connected parts is relatively large, which can prevent the bolt from loosening to a certain extent under vibration or impact loads. In addition, some hexagonal flange bolts will also adopt special anti-loosening measures, such as applying anti-loosening coatings on the threads or using self-locking nuts, etc., further improving the reliability of the connection.

Application Fields of the Hexagonal Flange Bolt

Automotive Industry: It is widely used in the connections of parts such as the automotive engine, chassis, and body. For example, the assembly of the engine cylinder block, the connection of the chassis suspension system, and the fixing of the body structural parts all require the use of hexagonal flange bolts. Its good sealing performance and high load-bearing capacity can ensure the safety and reliability of the vehicle during driving.

Mechanical Manufacturing: It is used for the assembly and connection of various mechanical equipment, such as machine tools, cranes, and reducers. In these equipment, the hexagonal flange bolt can withstand large loads, ensuring the stability and accuracy of the equipment. At the same time, its anti-loosening performance can prevent the connection from loosening due to vibration during the operation of the equipment.

Construction Engineering: It also has certain applications in the connection of building structures, especially in some parts with high requirements for waterproofing and sealing, such as roofs and basements. The hexagonal flange bolt can be used in combination with sealing washers to effectively prevent rainwater, groundwater, etc. from penetrating into the building, ensuring the durability of the building structure.

Pipeline System: It is commonly used for the connection and fixation of pipelines, such as in pipeline systems for petroleum, chemical engineering, water supply and drainage, etc. Its good sealing performance can prevent the leakage of the medium inside the pipeline, ensuring the safe operation of the pipeline system. At the same time, the high strength of the hexagonal flange bolt can withstand the pressure of the medium inside the pipeline and the external impact force.