In an interchangeable assembly, shafts of size 25.000−0.010+0.040

In an interchangeable assembly, shafts of size 25.000^{−0.010^+0.040} mm mate with holes of size 0.020 25.000^{−0.020^+0.030}mm. The maximum interference (in microns) in the assembly is

Maximum interference = Maximum size of shaft – Minimum size of hole = 25.040 – 25.020 = 20 μm