Selection of bolts is a delicate task, which requires skilled technology and rich experience. The correct choice of bolts must consider the requirements of the structure and application environment, as well as materials, specifications and mechanical properties, and the purchase of bolts must find a professional fastener manufacturer.
First of all, it is important to choose the appropriate bolt specification.
Factors influencing bolt specifications include required clamping torque, clamping surface area, structural size limitations, structural thickness, and material type, among others. After the bolt specification is determined, the bolt material can be selected according to the requirements of tightening moment, clamping moment and structural thickness. In general, the size of the steel bolt can be determined based on the existing size and volume of the structure.
The second is the choice of bolt use.
The requirements for mechanical properties are determined by the use of bolts. The mechanical properties of bolts include tensile strength, compressive strength, tensile elastic modulus, compressive elastic modulus and so on. Generally speaking, under standard conditions of use, it is recommended to choose corrosion-resistant steel bolts with a tensile strength above 1100MPa and a compressive strength above 850MPa.
In addition, after determining the bolt material and mechanical properties, there is another important technical index-strength grade. The strength grade can improve the tensile strength and compressive strength of the bolt to suit different application needs. Common bolt strength grades are 6.8, 8.8, 10.9 and 12.9, of which 6.8 is the general low strength and 12.9 is the highest strength.
Finally, the choice of bolt surface treatment.
When choosing bolts, the surface treatment of bolts must also be considered. Hebei Yunteng fastener manufacturer can do 8 kinds of bolt surface treatment, including hot dip galvanized, Black Oxide, Stainless Steel and so on. Surface treatment can increase the corrosion resistance and aesthetics of bolts, but it will also reduce the surface hardness and strength of bolts. Therefore, when choosing the surface treatment of bolts, the requirements of surface hardness, strength and corrosion resistance should be comprehensively considered to ensure the performance of bolts.
