C.2 Regarding ValueTagged angle values

Value Tagged angle values are more complex than for example torque values in the sense that it is a relative angle between the point of interest and a reference point. The reference point will be the origin in the angle coordinate system and every angle value before that point will have negative angle values.

This origin point can be configured differently on different systems and between different tightening programs. Some common cases of defining the origin are to

tie it to when a configured torque level is reached (in Figure 18), the dotted horizontal line would represent a configured torque level, and the angle would be just as in the picture), or

tie it to a step transition (in Figure 18), that would make the FINAL angle denote the angular difference between the solid line between the rundown step and the FINAL point), or

tie it to the snug point as described in the SNUG paragraph, or

tie it to the beginning of the tightening, thereby including the full rundown in a reported FINAL angle. (This would mean every reported angle would be positive unless it is a loosening)