Profile tolerance of a line

Profile tolerance of a line is used to control the ideal contour of a feature. The contour is defined by theoretically exact boxed dimensions and must be accompanied by a relative tolerance zone. This tolerance zone, unless otherwise stated, is taken to be equally disposed about the true form, and the tolerance value is equal to the diameter of circles whose centres lie on the true form. If it is required to call for the tolerance zone to be positioned on one side of the true form (i.e. unilaterally), the circumferences of the tolerance-zone circles must touch the theoretical contour of the profile.

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