Form and position tolerances must be denoted in the drawing.GB/T1182―1996The meaning of the code is specified, as well as the composition of the marked shape and position tolerances. Today, by Billion lerideLead you to understand the meaning of those special symbols and codes in mechanical drawings!
    1The bullet for form and position tolerance

    National standard: Shape and position tolerances are common14Each item, each feature item and symbol are shown in the figure1.1As shown.

figure1.1 Bullets for form and position tolerances

    2The code of form and position tolerance

    The national standard stipulates that the shape and position tolerance should be marked by code in the drawing, and when it is not possible to use code marking, it is allowed to use text in the technical requirements, and the shape and position tolerance code marking is shown in the figure1.2As shown.

figure1.2 Code for form and position tolerances

    3, position tolerance reference code

    For parts with position tolerances, the reference must be marked on the drawing. The composition of the reference code: reference symbol, circle, line and letter. Reference codes for position tolerances are shown1.3As shown.

figure1.3 Reference code for position tolerance

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