Lines that extend off the object to show what is being dimensioned
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The definition to an Extension Line is:A line used to visually connect the ends of a dimension line to the relevant feature on the part.How Extension Lines are used:Extension lines are solid and are drawn perpendicular to the dimension line.- DarKeneD
The 4 component of linear dimensions are: 1. Dimension Lines 2. Extension Lines 3. Arrowheads 4. Numeric Value of dimension
Extension has three syllables.
When surface datums are shown on extension lines, they are offset from dimension line arrows. Axis datums and center plane datums, on the other hand, can align with the dimension line's arrowheads.
VERTICAL LINES-lines that are at right angle and or perpendicular to a plane.HORIZONTAL LINES-lines that are parallel to the horizon.ANGULAR LINES-lines that have sharp edges. They can be long or short.CURVE LINES-lines that are without angles.SLANTING OR DIAGONAL-lines that suggest action or movement.JAGGED LINES-lines that are harsh and unpleasant.