Machining
ISO 286 fits
In short
Hole and shaft limits, clearance or interference, any class a to zc up to 500 mm. Example with the default values: Max clearance = 41 µm.
Calculation
Example calculated with the tool’s default values.
Inputs
- Nominal size
- 25 mm
- Fit
- H7/g6 · sliding
Results
- Max clearance
- 41 µmClearance fit
- Hole H7 max
- 25.021 mm
- Hole H7 min
- 25.000 mm
- Shaft g6 max
- 24.993 mm
- Shaft g6 min
- 24.980 mm
Worked example
Every value in this section belongs to the example, calculated with the tool’s default values.
Other results of the example
- Hole deviations ES / EI
- +21 / 0 µm
- Shaft deviations es / ei
- −7 / −20 µm
- Max clearance
- 41.0 µm
- Min clearance
- 7.0 µm
- Tolerance IT7 / IT6
- 21 / 13 µm
- Target sizes (mid)
- 25.0105 / 24.9865 mm
Step-by-step calculation
Tolerance grades
IT7, IT6 for Ø 25.0 (ISO 286-1, table 1)
21 µm, 13 µm
Shaft
es = table, ei = es − IT
es −7, ei −20 µm
Hole
EI = −es (same letter), ES = EI + IT
ES +21, EI 0 µm
Clearance
Jmax = ES − ei ; Jmin = EI − es (négatif = serrage)
+41 / +7 µm
Common fits at Ø 25
| Fit | Hole (µm) | Shaft (µm) | Max / min clearance (µm) |
|---|---|---|---|
| H11/c11 | +130 / 0 | −110 / −240 | +370 / +110 |
| H9/d9 | +52 / 0 | −65 / −117 | +169 / +65 |
| H8/f7 | +33 / 0 | −20 / −41 | +74 / +20 |
| H7/g6 | +21 / 0 | −7 / −20 | +41 / +7 |
| H7/h6 | +21 / 0 | 0 / −13 | +34 / 0 |
| H7/j6 | +21 / 0 | +9 / −4 | +25 / −9 |
| H7/js6 | +21 / 0 | +6.5 / −6.5 | +27.5 / −6.5 |
| H7/k6 | +21 / 0 | +15 / +2 | +19 / −15 |
| H7/n6 | +21 / 0 | +28 / +15 | +6 / −28 |
| H7/p6 | +21 / 0 | +35 / +22 | −1 / −35 |
| H7/s6 | +21 / 0 | +48 / +35 | −14 / −48 |
| H7/u6 | +21 / 0 | +61 / +48 | −27 / −61 |
Limits
Indicative results: they replace neither the applicable standards nor the job drawings and instructions. Check the values entered and the result before doing the work.
Sources
- ISO 286-1:2010 / NF EN ISO 286-1 : Système de codification ISO des tolérances : IT, écarts fondamentaux, règles des alésages (§ 5.3)
- RoyMech, ISO 286 tables : IT1–IT14 et écarts fondamentaux des arbres 0–500 mm (link)
- Calibr, ISO tolerance chart : Limites d’alésages et d’arbres (contrôle croisé, 733 valeurs) (link)
- RoyMech, ISO 286-2 shaft / hole limits : j5, j6, j7 et J6, J7, J8 de 3 à 400 mm (link)
- CheckedCalc, bearing fit tolerances (ISO 286-2:2010) : j5, j6, J7 jusqu’à 500 mm (link)
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