A screw joint can define the rotation of one part about an axis as the part translates along the axis with respect to the other part. It does not need that the two parts remain parallel with respect to the axis of rotation and translation. The defined axis by two points becomes the z axes of base marker and action marker. It becomes the axis of rotation and translation. However, the z-axis of the coordinate system marker on the first part and the z-axis of the coordinate system marker on the second part must always be parallel and co-directed. This joint has one degree of freedom. The translation of z-axis is constrained by a pitch about the rotational degree of freedom. The pitch value is the distance from one peak on a thread of the screw to the next thread. It defines the amount of translational displacement of the first part for every rotation of the second part about the axis of rotation.
Figure 1 Screw Joint icon on Working Window
Figure 2 Screw icon of the Joint group in the Professional tab