Typical application
Common for accurately guided, removable components and locating features that must remain assemblable.
Fits & tolerances · ISO 286
Calculate an H7/h6 fit
A precise clearance fit where the shaft can at most touch the zero line.
ISO286
02
Results
Fit selection
Compare common fits
Compare limit values at the current nominal size. Optionally narrow the results to a desired range in µm.
H7/h6 in practice
Understanding the limits
The theoretical minimum clearance is zero; manufacturing deviations can only increase clearance.
Alternatives
H7/g6 provides guaranteed minimum clearance. H7/k6 is suitable when closer location matters more than free movement.
From function to fit
What this calculator does
From nominal size plus hole and shaft tolerance classes, the calculator returns limit sizes and minimum/maximum clearance or interference.
ISO 286 defines hole and shaft sizes. Performance in the actual assembly also depends on temperature, form, surface texture, and assembly conditions.
Typical tasks
- Bearing and bushing seats
- Guides with controlled clearance
- Locating fits and removable hubs
Design notes and follow-up standards
Check before release
Operating temperature
Differential thermal expansion can turn clearance into interference, or the reverse.
Geometry and surface
Roundness, cylindricity, and roughness are not controlled by a size fit.
Functional requirement
Derive minimum clearance or interference from load, lubrication, and assembly needs.
Useful follow-up standards
ISO 1101
Geometrical tolerances for form, orientation, location, and run-out.
ISO 14405-1
Unambiguous specification of linear sizes on drawings.
ISO 21920
Surface texture specification for sliding, sealing, or joining functions.