Upper- or lowercase
Uppercase letters identify internal sizes; lowercase letters identify external sizes.
Tolerances · ISO 286
ISO 286 Single-size Tolerance Calculator
Calculate limit deviations, tolerance width, and minimum and maximum size for one ISO 286 hole or shaft tolerance class.
IT01–18
02
Tolerance result
Specify one size clearly
What this calculator does
From nominal size and one tolerance class, it returns lower/upper deviations, tolerance width, and limit sizes.
The single-size calculator helps interpret and define a tolerance zone. It deliberately does not decide which mating part provides the required function.
Typical tasks
- Limit sizes for inspection
- Review drawing callouts
- Compare hole and shaft specifications
Design notes and follow-up standards
Check before release
Measurement principle
A two-point diameter does not fully describe form deviation.
Assess the fit separately
Combine both tolerance zones whenever clearance or interference matters.
Useful follow-up standards
ISO 14405-1
Defines unambiguous specification and interpretation of linear sizes.
ISO 8015
Fundamental GPS rules and independence of requirements.
ISO 1101
Adds the geometrical tolerances required beyond size.