Lines of different types and thicknesses are used for graphical representation of objects. The
types of lines and their applications are shown in Table. Typical applications of different
types of lines are shown in Figs.
THICKNESS OF LINES
Two thicknesses of lines are used in draughting practice. The ratio of the thick to thin line
should not be less than 2:1. The thickness of lines should be chosen according to the size and
type of the drawing from the following range:
0.18, 0.25, 0.35, 0.5, 0.7, 1, 1.4 and 2
It is recommended that the space between two parallel lines, including hatching, should
never be less than 0.7 mm.
