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Alphabet of Lines

Line Types used in Drafting & Design

QuestionAnswer
What line type is used to represent visible edges and outlines of the object being drawn. Visible
What line type represents edges and outlines of an object that are not visible in a given view. Hidden
This line type appears only on a sectional view where the surface has been cut. Normally drawn diagonally. Section
What line type indicates symmetry, center points, or axes. Consists of alternate long and short dashes. Centerline
This line type denotes the extent of the dimension when used in conjunction with arrowheads. Dimension
What line type extends the surface or point away from the view for the purpose of dimensioning. Extension
This line type is drawn diagonally, it directs a dimension or note to the area where it applies. Normally terminates with an arrowhead, but may terminate with a dot. Leader
What thick line type shows where the imaginary cutting takes place to create a sectional view. The arrowheads indicate the direction of sight. Cutting Plane
This type of break line terminates a view to conserve space and avoid congestion. Also separates internal and external features with broken-out sections. Short
This type of break line allows removal of a long central portion of an object to shorten a view. Normally used in pairs. Long
This line type represents the outline of an adjacent part; shows alternate position of a given part; or replaces repetitive detail, such as spring coils, gear teeth, threads, etc. Phantom
This line type is the heaviest line used in drafting. These lines are used to frame in your drawing to create focus and drawn the eye of the viewer to the object. Border
Created by: lddforester
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