Documented deviations required
Shaft–Hole Fit from Limit Deviations
Calculate size limits and the full clearance/interference range from deviations copied from an identified drawing, specification or licensed standard.
Calculated limit sizes and fit range
Input convention
D is the common basic size in millimetres. EI and ES are the lower and upper hole deviations; ei and es are the lower and upper shaft deviations, entered in micrometres. The calculator requires ES≥EI and es≥ei. A positive deviation is above D and a negative deviation is below D.
Shaft limits = D + ei/1000, D + es/1000
Цmax = hole upper − shaft lower = ES − ei
The second form gives clearance directly in µm because both deviations use the same basic size. Hole tolerance is ES−EI, shaft tolerance is es−ei, and fit tolerance is their sum, equal to Cmax−Cмин. These are arithmetic consequences of the entered limit deviations; they are not an ISO table lookup. The explicit computational range D≤1,000,000 mm and |deviation|≤1,000,000,000 µm prevents extreme floating-point values from implying false micrometre precision; it is not an ISO applicability limit.
Classification and zero boundaries
- If Cмин≥0 and Cmax≥0, every limit combination has clearance; a zero endpoint is explicitly labelled as a boundary.
- If Cмин≤0 and Cmax≤0, every limit combination has interference; a zero endpoint is explicitly labelled as a boundary.
- If Cмин<0<Cmax, the limits permit either clearance or interference, so the result is transition.
- If both are exactly zero, the entered zero-width zones coincide; the page reports a zero-line condition rather than inventing a practical fit recommendation.
ISO 286 context — not a conformity calculator
ISO 286-1:2010, edition 2 establishes the code system, concepts and fit terminology for linear sizes of cylinders and two opposite parallel surfaces. It is Published and was confirmed in 2026; its catalogue also lists Cor 1:2013.
ISO 286-2:2010, edition 2 contains the tables of standard tolerance classes and upper/lower limit deviations. It is Published and under systematic review (stage 90.20); the official record lists ISO 286-2:2010/Cor 1:2013. The numerical tables are not reproduced here and were not verifiable from the public catalogue pages.
Applicability: use the same basic size for the paired features and deviations from the controlling, correctly interpreted source. This arithmetic does not account for geometric tolerances, form, orientation, location, surface texture, measurement uncertainty, temperature, material deformation, assembly force, lubrication or functional suitability. It cannot select a fit for an application.
Official sources: ISO catalogue records for Parts 1 and 2 and the Part 2 corrigendum linked above. Status checked 12 July 2026. Exact clauses and numerical table rows are intentionally not asserted without the licensed documents.
Why are H7/h6 menus absent?
Those codes require exact, edition-controlled values from ISO 286-2 tables, including the correct basic-size step and corrigendum. The former page embedded unsourced values and application labels. This corrected page will not guess them.
Can I enter deviations from a drawing?
Yes. Identify the drawing and revision in the source field, ensure all four deviations refer to the same basic size, and independently confirm the drawing’s units and acceptance rules.
