The tightening torque of bolts is an important basis for selecting the type and style of bolts. For standard bolts, there is a fixed range of tightening torque, which can be used to select the bolts accordingly. Generally speaking, the tensile and shear strength of screws is certain, and in actual use, the tightening force should be calculated based on the specific connection stress, and then suitable specifications of screws and bolts should be selected.

The bolt tightening torque is an important basis for selecting the type and style of the bolt. For standard bolts, there is a fixed range of bolt tightening torque, which can be used to select the bolt.

Generally speaking, the tensile and shear strength of screws is certain, and in actual use, the tightening force should be calculated based on the specific connection stress, and then the appropriate specifications of screws and bolts should be selected.

Bolt tightening torque calculation

T=KFd

T: Torque for tightening the nut

K: Torque coefficient (approximately taken as 0.2)

F: Pre-tightening force

d: Major diameter of the bolt

Note: For general connections using steel bolts, it is recommended to determine according to the following relationships

Carbon steel: F<=(0.6~0.7) Os A1

Alloy steel: F<=(0.5~0.6) Os A1

Os: Yield limit of the bolt material

A1: Hazardous cross-sectional area of the bolt