This table provides reference tolerances based on the ISO 286 standard for shafts and holes. Use the filters below to find the appropriate upper and lower deviations for your nominal dimension and tolerance grade.
ISO 286 defines a system of tolerances for holes and shafts, based on IT grades and fundamental deviations. These tolerances help ensure proper fit between parts in manufacturing processes.
An IT (International Tolerance) grade defines the allowed variation in dimension. Lower IT numbers represent tighter tolerances.
The table below lists tolerance widths (in microns) for selected nominal size ranges and IT grades.
Enter hole and shaft deviations to determine the fit type between components.
Q1: What’s the difference between clearance, transition, and interference fit?
Q2: How are ISO tolerances applied in CNC machining?
Q3: How do I choose the correct IT grade?
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