What is the torque for a 12mm connecting rod bolt?

[LaEmmanuel]

There is no precise torque value as it depends on the bolt grade. The specification for a 12mm bolt corresponds to an M12 screw. The screw length refers to the effective length embedded in the object being fastened. For countersunk screws, the total length is considered; for half-countersunk screws, half the head length is added, while for cylindrical head screws, the length does not include the head dimension. For specifications, it's best to include the thread pitch in the full description. Additional information: The common method for bolt tightening is the medium torque control method. This method applies assembly torque to the bolt while it is in the elastic region, where torque and clamping force have a linear relationship, achieving the clamping effect on the parts. With the torque control method, the clamping stress of the bolt typically reaches 50% to 65% of the material's yield limit, meaning the bolt utilization rate is 50% to 65%, which is relatively low. The preload dispersion is ±16% to ±35%, which is relatively large.