Important reference basis for standard calculation of bolt tightening torque
If you want to choose bolts that suit your needs, it is particularly important to understand how bolt tightening torque is calculated. Bolt tightening torque standards are also an important reference for selecting bolt styles and models. This article will introduce in detail the bolt tightening torque standards and calculation methods for your reference.
Bolt tightening torque calculation
The calculation formula of bolt tightening torque is T=KFd, where T represents the torque to tighten the nut, K represents the torque coefficient, which is generally selected as 0.2, F is the pretightening force, and d refers to the major diameter of the bolt.
It should be noted that the calculation method of bolt tightening torque depends on the specific situation. Generally speaking, when connecting with steel bolts, it is recommended to determine the pretightening force according to the following relationship:
Carbon steel: F<=(0.6~0.7)OsA1
Alloy steel: F<=(0.5~0.6)OsA1
Among them, Os is the yield limit of the bolt material, and A1 is the dangerous cross-sectional area of the bolt.
Bolt tightening torque standards
The bolt tightening torque standard refers to the predetermined tightening torque value that needs to be achieved during the bolt connection process. Tightening torque standards are generally specified by manufacturers or industry standards, which can ensure the performance and reliability of mechanical connection 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 relatively 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 bolt tightening torque standard is incorrect or does not meet the standard, it will affect the stability and reliability of the bolt connection system, and even cause safety hazards.
Summarize
The above is a detailed introduction to the bolt tightening torque standards and calculations. During the selection and use of bolts, it is very important to correctly calculate the bolt tightening torque and reference standards. 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.
