Select a common ISO fit and nominal size to see hole limits, shaft limits, and resulting clearance or interference.
| ISO Fit | Type | Use Case |
|---|---|---|
| H11/c11 | Clearance | Loose running, large temp variation |
| H9/d9 | Clearance | Free running, bearings, long shafts |
| H8/f7 | Clearance | Close running fit |
| H7/g6 | Clearance | Sliding fit, precision location |
| H7/h6 | Clearance | Locational, snug fit |
| H7/k6 | Transition | Locational, light tapping to assemble |
| H7/n6 | Transition | Locational, press or shrink |
| H7/p6 | Interference | Light press fit |
| H7/s6 | Interference | Medium drive, permanent assembly |
| H7/u6 | Interference | Force fit, heavy duty |
ISO fit classes define the allowable clearance or interference between a shaft and hole. Choosing the right fit — H7/g6 for a sliding fit, H7/p6 for a press fit — is how engineers specify assemblies, and machinists need to know the actual limit dimensions to hit.
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