Choosing the strength of bolts requires considering multiple factors, including the required bearing capacity, stress environment, and service conditions. Generally speaking, you can choose according to the following steps:
1.Determine the required bearing capacity: Determine the required bolt bearing capacity based on design requirements and load conditions.
2.Know the material strength grade: Bolts usually use standardized material strength grades, such as 8.8, 10.9, 12.9, etc. These grades represent the minimum tensile and shear strength of the bolt.
3.Select the strength grade according to the stress environment: select the appropriate bolt strength grade according to the stress environment and service conditions. For example, in high temperature or corrosive environments, it may be necessary to select bolts with higher strength and corrosion resistance.
4.Consider preload and relaxation factors: When selecting bolt strength, it is also necessary to consider preload and relaxation factors. The pre tightening force is to ensure the tightening force of the bolt connection, while the relaxation factor is to consider the possible loosening of the bolt during use.
Please note that the above are only general selection steps, and specific selection needs to be evaluated based on specific circumstances and design requirements. It is recommended to consult professional engineers or refer to relevant standards and specifications when designing important structures.
Post time: Aug-28-2023