Where is the tightening torque preferably applied in a high tensile bolt connection?

When tightening a high tensile bolt connection, the preferred location to apply the tightening torque is to the nut. This method ensures that the bolt's tension is properly controlled and allows for adequate clamping force to be delivered to the connected elements.

Applying torque to the nut is more efficient because it creates a rotational force that translates into axial tension within the bolt itself. This tension is crucial as it helps in securing the joint and preventing any loosening due to vibrations or external loads.

In contrast, applying torque to the bolt head, washer, or surrounding structure may not achieve the same level of control over the tension in the bolt, potentially leading to inadequate clamping forces or uneven stress distribution across the connection. By focusing on the nut, the operator can ensure that the tightening process is evenly applied and maximizes the performance and safety of the high tensile bolt connection.