Typical application
Common for gears, pulleys, or coupling hubs that need accurate location while remaining removable.
Fits & tolerances · ISO 286
Calculate an H7/k6 fit
A close transition fit for accurate location.
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/k6 in practice
Understanding the limits
Actual limits may produce slight clearance or slight interference, so classification must be checked at the selected nominal size.
Alternatives
H7/h6 remains a clearance fit. H7/n6 substantially increases the likelihood of a tight seat.
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.