Where D is the geometric mean of the basic size step in mm
The values for standard tolerances in grades IT5 to IT18 for basic sizes up to and including 500 mm are determined as a function of the standard tolerance factor, i. None: The table values for tolerances in these grades have been approximately scaled in geometrical progression between the values for IT1 and IT5.įormula for Standard Tolerance grade IT5 to IT18
Formula for Standard Tolerance Grade IT2.
