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Fits & size limits

Calculate clearance from hole and shaft limits

Use the actual minimum and maximum sizes from your drawing or applicable table. The result is signed diametral clearance, not radial eccentricity or an assembly approval.

Enter values →Sources and scope ↓

Your inputs

Hole limits
Shaft limits

All four sizes must use the same unit and reference temperature. Obtain them from the drawing or its applicable table.

Your result

Enter known values and calculate. Source examples are available above.

Formula and worked example

Minimum clearance = Hmin − Smax; maximum clearance = Hmax − Smin. The 25 H7/g6 example gives 0.007–0.041 mm. Negative values mean interference; these are diameter differences.

Where the limits come from

The two example presets use KHK’s published JIS B 0401-2:1998 excerpt at 25 mm. Other sizes and editions require their own table entries. No deviations are guessed from a typed fit code.

Diameter is not radius

A maximum diametral clearance of 0.034 mm corresponds to 0.017 mm possible one-sided radial offset for ideal circular geometry. It must not be reported as 34 µm radial eccentricity. Real form, contact and measurement effects need separate evaluation.

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25 mm examples derived from KHK’s JIS B 0401-2:1998 excerpt
ExampleHole limits · mmShaft limits · mmDiametral clearance · mm
25 H7/h625–25.02124.987–250–0.034
25 H7/g625–25.02124.980–24.9930.007–0.041

Continue your task

Clearance fit: understand the zero boundary →Interference fit: distinguish size overlap from capacity →Read the letter: tolerance-zone position →

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.

Open the original source ↗
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.

Open the original source ↗