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  1. #1

    Exclamation I dont know what those sign mean in drafting ?

    can anybody help me about symbols and signs in drafting ? for example A letter downside of the circle which cut throuh center with line ?

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  2. #2
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    Jul 2006
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    If you're asking about the symbol, this is the international drafting symbol for a diameter.

    Here's a link that shows a list of various mechanical drafting symbols: http://www.draftingzone.com/shoppingzone/6-1.pdf

    If you have a different symbol, please attach a picture of the symbol you're asking about and a picture of the entire drawing to help us provide an exact answer.
    Last edited by MrCATIA; June 23rd, 2016 at 07:18 PM.

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  3. #3
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    You might be asking about Datum Target symbols. These symbols define the areas used to establish the datum planes used in GD&T (Geometric Dimension and Tolerance) systems.

    Here's an example drawing with Datum symbols (square) and Datum Target symbols (circle): http://images.books24x7.com/bookimag...2/figu36_1.jpg

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  4. #4

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    Thank you so much for Pdf file which helped me a lot

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