Limits & Fits

ISO 286 hole and shaft limits, computed from the standard's formulas. Sizes 1 to 500 mm.

Fit

Nominal size (mm) Common fits Hole Shaft Output units

Results

Computed from the ISO 286-1 formula set (tolerance factor, IT grade multipliers, fundamental deviation formulas) and verified against known values like 25 H7/g6. A few printed table values can differ by one rounding step. Interference letters (p, r, s) use fixed tabulated deviations in the standard rather than the formula set this tool computes from; adding them as a verified lookup is planned — until then, work press fits from the standard's tables. Verify critical fits against the governing standard.

Further reading: Understanding H7/g6 Callouts