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Fits & size limits

Clearance fit: understand the zero boundary

A non-negative signed clearance interval has no size-only interference. A zero minimum is a theoretical boundary, not proof that real parts slide together freely.

Sources and scope ↓

Check both extremes

Minimum clearance is the smallest hole minus the largest shaft; maximum clearance is the largest hole minus the smallest shaft. Use all four limits.

Read the example accurately

The 25 H7/h6 example gives 0–0.034 mm diametral clearance. Temperature, surface, form error, contamination and measurement uncertainty are outside this interval calculation.

Continue your task

Calculate clearance from hole and shaft limits →Interference fit: distinguish size overlap from capacity →Bearing fit is different from internal clearance →

All tolerance and surface references →

Sources and review scope

Reviewed 23 October 2026. Arithmetic examples are labelled separately from source-table facts and standard scope.

ISO 286-1:2010

Public catalogue: terminology, code system and scope. Full clauses not reviewed.

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KHK hole tolerance table

Manufacturer table explicitly excerpting JIS B 0401-2:1998. H7 row for 25 mm: 0 / +21 µm.

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KHK shaft tolerance table

Manufacturer table excerpting JIS B 0401-2:1998. At 25 mm: h6 −13 / 0 µm; g6 −20 / −7 µm. These are scoped examples, not a full ISO table audit.

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