Visible Line : Visible Line Is a heavy with solid lines. It is used as out outline in drawing
Invisible Line: Invisible Line Represents surfaces or edges hidden from the view by other parts. It is a broken and heavy line.
Dimension Line: Dimension Line is light with arrowheads placed at the ends of the line. These are broken at the middle to provide space for dimension.
Cutting Plane Line: Cutting Plane Line Consist of an imaginary line cut through an object. It is made up of long, heavy dashes, with two alternate dashes.
Center Line: Center Line Is use to locate the center of an object, arcs, and circles.
Section Line: Section Line Use in making section views. It is a medium line.
Long Break Line: Long Break Line is a well-defined break line to show that a part of the drawing has been cut-off. It is a heavy line.
Short Break Line: Short Break Line Is a freehand and heavy line showing part of an object has been broken off.
Border Line: Border Line It is an extra-heavy line. It enclose drawing or work.