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ALPHABET OF LINES
Alphabet of Lines
14
Other
Undergraduate 1
03/05/2012

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Term
Used to represent visible edges and outlines of the object being drawn.
Definition
VISIBLE LINE
Term
Represents edges and oulines of an object that are not visible in a given view.
Definition
HIDDEN LINE
Term
Appear only on a sectional view where the surface has been cut. Normally drawn diagonally.
Definition
SECTION LINES
Term
Indicates symmetry, center points, or axes. Consists of alternate long and short dashes.
Definition
CENTER LINE
Term
Denotes the extent of the dimension when used in conjunction with arrowheads.
Definition
DIMENSION LINE
Term
Extends the surface or point away from the view for the purpose of dimensioning
Definition
EXTENTION LINE
Term
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.
Definition

LEADER

Term
Shows where the imaginary cutting takes place to create a sectional view. May be a series of long dashes, or alternately, two short dashes between single long dashes. Arrowheads indicate the direction of sight.
Definition
CUTTING-PLANE LINE
Term
Used in conjunction with removed views to show where the view would normally appear. Arrowheads indicate the direction of sight.
Definition
VIEWING-PLANE LINE
Term
Terminates a view to conserve space and avoid congestion. Also separates internal and external features with broken-out sections.
Definition
SHORT BREAK LINE
Term
Allows removal of a long central portion of an object to shorten a view. Normally used in pairs.
Definition
LONG BREAK LINE
Term
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. Drawn with 2 short dashes between single long dashes, but thinner than the cutting/viewing-plane line.
Definition
PHANTOM LINE
Term
Used to indicate an area or portion of a surface that is to receive special treatment.
Definition
CHAIN LINE
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