What Are Break Lines in Technical Drawing?
A break line is used in engineering drawings to indicate that a portion of the part being designed is not shown. The type of line, and thickness, is determined by the shape of the part being designed. These standards may vary slightly among various reference materials.
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Purpose
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A break line indicates that a portion of the item is not shown on the drawing. This is necessary for reasons of space or drawing clarity.
Thickness
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Break lines are usually either .3mm to .5mm or .7mm to .9mm thick, depending on the situation.
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Round Part
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The line used would be a .3mm to .5mm thick S-shaped line.
Rectangular Part
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The line would be .3mm to .5mm thick with a Z-shape in the middle. A break would be used in the dimension line to indicate the part was not drawn to scale.
Wavy Line
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A wavy line .3mm to .5mm thick is acceptable on rectangular parts.
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