ALPHABET OF LINES

a thick line that represents the visible edges or outline of the

object; also known as the object line.

• Hidden line

• Visible line

• Center line

• Section line

a medium thick line composed of short dashes about 2-3

millimeters long with space between dashes about 1-2 millimeters wide; itt

represents the surface or edges that cannot be seen.

• Hidden line

• Visible line

• Center line

• Section line

a thin line consisting of two long dashes and short dash drawn

alternately with a gap of at least 2 millimeters in between; it represents the

axis or center of symmetrical shapes like a ball, washer, rectangular block,

cube

• Hidden line

• Visible line

• Center line

• Section line

a thin lines to show the surface that has been cut; they are

spaced evenly at 45 degrees with the horizontal to make shaded effect.

• Hidden line

• Visible line

• Center line

• Section line

a thin line that shows position(s) of part of an object that

moves drawn by two short dashes and one long dash.

• Extension line

• Leader line

• Phantom line

• Dimension line

Medium line with arrowhead to show notes or label for size

or special information about a feature.

• Extension line

• Leader line

• Phantom line

• Dimension line

Thin and dark line use to show the

starting and ending of dimension.

• Extension line

• Leader line

• Phantom line

• Dimension line

Thin and dark lines use to show the size (span) of an object with a

numeric value. Usually terminates with arrowheads or tick marking

• Extension line

• Leader line

• Phantom line

• Dimension line

Visible line

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SECTION LINE

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