Scales for Technical Drawings:
Like per the Indian standard, the make designation of a scale shall consist of the word 'SCALE' followed by the indication of its ratio as given like:
SCALE 1: 1 using for full size
SCALE X: 1 using for enlargement
SCALE 1: X using for reduction
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Category
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Recommended Scales
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Enlargement Scales
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50 : 1
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20: 1
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10 : 1
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Full Size
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1 : 1
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Reduction
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1 : 2
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1 : 5
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1 : 10
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Scales
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1 : 20
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1 : 50
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1 : 100
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1 : 200
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1 : 500
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1 : 1000
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1 : 2000
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1 : 5000
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1 : 10000
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Notice : A scale to be selected for a drawing will depend on the complexity of an object to be depicted and the reason of representation. During all cases, the chosen scale shall be large sufficient to permit clear and easy interpretation of the information depicted.