Wire drawing: the major diameter of external thread is thick solid line, and the minor diameter is thin solid line. If it is not full thread, the thread termination line should be drawn to a large diameter and be a thick solid line; In the axial view, the large diameter is the whole circle of thick solid line, and the small diameter is more than 3/4 of the circle of thin solid line.

The major diameter of the internal thread is a thin solid line, the minor diameter is a thick solid line, and the thread termination line is the same as that of the external thread. In axial view, the small diameter is the whole circle of thick solid line, and the large diameter is more than 3/4 of the circle of thin solid line.

Thread connection diagram: the thread part is drawn according to the external thread diagram.