TOLERANCE TOOL

ISO Fits and Tolerances Calculator

Select all 28 hole-zone and 28 shaft-zone positions with IT5–IT11 to calculate limits, clearance or interference under ISO 286.

CALCULATE FIT ↓← TOOLS HUB

AVAILABLE TOOLH7 / g6

+210−7−20

28 hole positions · 28 shaft positions · IT5–IT11 · Ø≤500 mm

ISO 286 · HOLE AND SHAFT TOLERANCE SYSTEM

Enter the nominal size and tolerance classes to calculate the hole limits, shaft limits and worst-case clearance or interference.

Range: Ø greater than 0 to 500 mm · 28 hole-zone positions · 28 shaft-zone positions · IT5–IT11.

CALCULATED RESULT

Ø20 H7/g6

Clearance fitThe hole is never smaller than the shaft at the stated limits.

Hole limits · H7

Minimum: 20.000 mm
Maximum: 20.021 mm
Lower deviation · EI: 0 µm
Upper deviation · ES: +21 µm

Shaft limits · g6

Minimum: 19.980 mm
Maximum: 19.993 mm
Lower deviation · ei: -20 µm
Upper deviation · es: -7 µm

Tolerance-zone positionsNominal-size line

H70 µm → +21 µm

g6-20 µm → -7 µm

-27 µm0 µm+28 µm

Minimum clearance0.007mm · +7 µm

Maximum clearance0.041mm · +41 µm

ISO size step18–30over 18 mm · up to and including 30 mm

How to read the result

ES/EI are the upper/lower hole deviations; es/ei are the upper/lower shaft deviations.
Minimum clearance = minimum hole − maximum shaft; maximum clearance = maximum hole − minimum shaft.
The result does not compensate for temperature, roughness, coating, assembly deformation or inspection method.

SOURCE & SCOPE

Reference data: ISO 286-1:2010 and ISO 286-2:2010. Check the drawing, standard revision and inspection requirements before production release.

ISO 286-1 ↗ISO 286-2 ↗

Machining tools hub ↗Precision hole machining ↗

FAQ

Frequently asked questions

What type of fit is H7/g6?

Within this calculator's range, H7/g6 is a clearance fit: the g6 shaft zone is below nominal while the H7 hole starts at nominal.

Does H7/h6 always have clearance?

H7/h6 has zero minimum clearance at maximum material condition. Actual sizes within the tolerance zones create clearance from zero to the calculated maximum.

Which fit groups are available?

Quick selections cover clearance, transition and interference fits. Custom mode includes all 28 hole and 28 shaft zone positions up to 500 mm; choices without a tabulated value at the entered size are disabled.

Can the result be used directly for acceptance?

Check the standard and revision stated on the drawing, inspection conditions, temperature, coating and functional requirements before using the result for acceptance.