Have limits on the drawing?
Enter the minimum and maximum hole and shaft sizes in the limit calculator. Positive clearance means the hole is larger; negative clearance means interference. If the range crosses zero, either outcome is possible.
Have only a code such as H7/g6?
Keep the nominal size, hole/shaft letters, grades and standard edition. Read the corresponding deviations from the applicable source table. A letter or grade by itself is not a complete limit size.
A useful comparison at 25 mm
The scoped KHK examples give H7/h6 a 0–0.034 mm diametral-clearance range and H7/g6 a 0.007–0.041 mm range. In this example, g6 gives more clearance, not a tighter fit.
Swipe to read all columns →
| Example | Hole limits · mm | Shaft limits · mm | Diametral clearance · mm |
|---|---|---|---|
| 25 H7/h6 | 25–25.021 | 24.987–25 | 0–0.034 |
| 25 H7/g6 | 25–25.021 | 24.980–24.993 | 0.007–0.041 |
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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.
Open the original source ↗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 ↗