Technical drawings administer clear and also accurate information how an item is to be manufactured. It shows and describes clearly and accurately the information forced to develop or to produce a product.

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The technical drawing is a kind of architecture communication based on line icons recognized and also understood worldwide. Hence, technical illustration is regularly referred to as a universal language taken (readable) by anyone nevertheless of the language lock speak.


Contractors, estimators, tradesmen, and also builders rely completely on technical illustrations for the info they must build, construct and also manufacture a product. To occupational in the design and manufacturing industries, the research of technological drawing; capability to prepare, read and also interpret technical drawing is essential.

Line symbols supplied in technical drawing are regularly referred to together ALPHABET that LINES. The usage of heat symbols allows engineers/designers come express the attributes of designed products plainly and accurately. Line functions vary not just by width but also by just how they room graphically represented in a drawing.

Line definition is conveyed through line weight or thickness of the line. Every heat is drawn at different thicknesses and darkness to express contrast and importance. Currently that room less essential are thin and light. The vital to successful drafting is to have actually a an excellent technical expertise of these miscellaneous line features – to know where and when to apply them in technological drawing.

ALPHABET of LINE

1. OBJECT OR visible LINES – thick dark line use to present outline of object, clearly shows edges and surfaces.

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2. CONSTRUCTION LINE – very light and thin line use to build layout work.

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3. DIMENSION LINE – Thin and dark lines usage to present the size (span) of an object with a numeric value. Generally terminates v arrowheads or tick markings.

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4. HIDDEN LINE – short dash lines usage to present non clearly shows surfaces. Usually shows as medium thickness.

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5. CENTER LINE – Long and also short dash lines. Normally indicates facility of holes, circles and arcs. Line is thin and dark.

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6. EXTENSION LINE – Thin and dark line usage to present the beginning and ending of dimension.

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7. CUTTING aircraft LINE – Extra thick lines usage to display cutaway views or aircraft of forecast where a section view is taken. Arrowhead indicates the direction the view.

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8. SHORT and also LONG break LINES –Short and long tool line usage to show cutaway view of a lengthy section.

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9. LEADER LINE – medium line v arrowhead to display notes or brand for dimension or one-of-a-kind information around a feature.

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10. PHANTOM LINE – lengthy line complied with by two brief dashes use to show alternative position of a relocating part.

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11. SECTION LINE – medium lines attracted at 45 levels use to display interior watch of solid areas of cutting plane line.