Upper deviation of tooth thickness at reference diameter

The deviation of base tangent length is the difference between the actual and nominal measurements of the base tangent length. 

Instead of the deviation and tolerance series, the deviation of base tangent length A_Ste and A_Sti can be entered as absolute values in µm.

The upper deviation of base tangent length A_Ste must be greater than or equal to the lower deviation of base tangent length A_Sti