The Zeiss ISO 2768-2 PDF shows that these tolerances depend on the length of the feature being measured:
ISO 2768-2 covers geometrical tolerances for features without individual geometrical tolerance indications. It specifies general tolerances in three tolerance classes: H, K, and L. The covered geometrical characteristics include: Iso 2768 General Tolerances Pdf
The standard provides a set of general tolerance zones, which are used to specify the acceptable limits of variation for these geometric characteristics. The Zeiss ISO 2768-2 PDF shows that these