After tightening a bolt to a specific torque value (using a torque wrench), further tightening by a specified number of degrees ensures that the bolt is stretched to the desired level, improving its clamping force and reducing the likelihood of loosening under stress. This is called angle tightening or angle torqueing. This method is particularly important for situations where maintaining a consistent clamp load is critical, such as in aerospace, automotive, and some industrial applications.
Therefore, a "degree in torquing" isn't a standalone unit; it's a *degree of rotation* added *after* reaching a specified torque.