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Item numbers

On the position of numbers, according to DIN ISO 6433 standard, is each component and each sub-group in an assembly assigned a number. With the help of this number can position each component in the drawing over the BOM to be identified.

To the position number of each component is evidence to make the item numbers in the group by drawing item numbers symbol reference line and each component is assigned. Note the lines may be at the end of an arrow icon or even a point symbol, and must not cross. Note the lines should be as short as possible, but should be long enough that the item numbers far enough from the group drawing away.

It is recommended item numbers in the group drawing always in a series of vertically or horizontally arranged. If a component within a group drawing appears several times, he has the item number will be assigned only once. The item numbers can be either free image besides the line to a reference line or within a circle (with the reference line is connected) are drawn.
If the individual components of an assembly by position assign meaningful numbers, you can do this eg in accordance with the assembly sequence done.

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