Control of pre-tightening tapping screw suppliers measuring torque wrench-measure the pre-tightening torque, as shown in the figure below; fixed torque wrench-when reaching a fixed tightening torque
In the connection of threaded fasteners, the main possible factors that lead to the relaxation of the pre-tightening force are: contact surface subsidence, mutual influence of bolt groups, seal ring deformation
The pre-tightening force control method of important bolt connection. However, measurement devices (such as micrometers, ultrasonics, etc.) are inconvenient to implement in specific connection structures and affect production