Operating temperature
Differential thermal expansion can turn clearance into interference, or the reverse.
Fits & tolerances · ISO 286
ISO 286 Tolerances and Fits
Calculate limit sizes, deviations, minimum clearance, and maximum clearance for holes and shafts.
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.
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
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.