ISO Limits & Fits Calculator
This tool computes hole/shaft limits and fit type per ISO 286 using the standard tolerance unit i, IT grades, and fundamental deviation formulas. Choose your hole and shaft classes (e.g., H7/g6) and enter the basic size. Results show EI/ES, ei/es, and min/max clearance or interference in mm with an inch hint.
Formulas used
Standard tolerance unit: i [µm] = 0.45·D^(1/3) + 0.001·D, with D in mm. IT width = multiplier × i (IT5=7i, IT6=10i, IT7=16i, IT8=25i, IT9=40i, IT10=64i, IT11=100i, IT12=160i, IT13=250i, IT14=400i, IT15=640i, IT16=1000i).
All formulas are evaluated in µm and converted to mm/in for display. This tool prioritizes common ranges up to 500 mm.