If you want to choose a bolt that suits your needs, it is particularly critical to understand the calculation method of bolt tightening torque. The standard of bolt tightening torque is also an important reference for selecting bolt style and model. This paper will introduce the standard and calculation method of bolt tightening torque in detail for your reference. Calculation of bolt tightening torque The calculation formula of bolt tightening torque is T=KFd, where T indicates the torque of tightening the nut,K indicates the torque coefficient is generally selected 0.2,F is the pre-tightening force, and d refers to the large diameter of the bolt.
It should be noted that the calculation method of bolt tightening torque depends on the specific situation. In general, when the connection is made of steel bolts, it is recommended to determine the preload according to the following relations:
Carbon steel :F<=(0.6~0.7)OsA1
Alloy steel :F<=(0.5~0.6)OsA1
Where,Os is the yield limit of the bolt material and A1 is the dangerous section area of the bolt.
Standard bolt tightening torque The standard bolt tightening torque refers to the preset tightening torque value that must be achieved during bolt connection. Tightening torque standards are generally specified by manufacturers or industry standards to ensure the performance and reliability of mechanical coupling systems. According to different bolt types, uses, working environments and requirements, tightening torque standards are also different. For example, some high-strength bolts have higher tightening torque standards, while some simpler bolts have lower requirements. In the actual use of bolts, the correctness of the tightening torque standard and whether it can be achieved is the key. If the standard of bolt tightening torque is not correct or does not meet the standard, it will affect the stability and reliability of the bolt connection system, and even have safety risks. The above is a detailed introduction to the standard and calculation of bolt tightening torque. In the process of bolt selection and use, the correct calculation of bolt tightening torque and reference standards are very important. Only by understanding these knowledge points can we better ensure the performance and reliability of the mechanical connection system and ensure the safety of personnel.
