How to use
Enter the common nominal diameter in mm and choose hole and shaft classes. Deviations are in µm; size limits and clearances in mm. Negative clearance means interference.
Example calculation
Ø25 H7/h6 → H7: 25.000–25.021 mm; h6: 24.987–25.000 mm; Δ: 0.000–0.034 mm
Calculation method
Results use the stated subset of the sources below. Numerical conversions and limits are explicit.
Dmin = D + EI/1000; Dmax = D + ES/1000; Δmin = Dmin − dmax; Δmax = Dmax − dmin
Calculation limits
Only the stated classes and diameter range are supported; each band includes its upper boundary. Thermal effects, form errors and roughness are excluded. This does not automatically select an appropriate fit.