What standards does the hole tolerance calculator use?

The hole tolerance calculator is based on ISO 286-1 and ISO 286-2 for the ISO code system of tolerances on linear sizes and ANSI/ASME B4.2 for preferred metric limits and fits. It provides hole deviations and size limits for common designations such as H6, H7, JS6, K7 and others.

What units are used in the hole tolerance calculator?

Nominal size and calculated hole limits are expressed in millimetres (mm). The upper and lower deviations are reported in micrometres (μm), where 1 μm equals 0.001 mm.

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ISO Hole Tolerance Calculator

The hole tolerance calculator determines preferred hole tolerances according to ISO 286-1, ISO 286-2 and ANSI/ASME B4.2 metric standards. For a given nominal size and hole tolerance designation (for example H7, JS6 or K7), the calculator returns the upper and lower deviations in μm and the resulting maximum and minimum hole sizes in mm.

Hole tolerance calculator

Input parameters
Parameter	Value	Unit
Nominal size		mm
Hole tolerance		—

Note: Use a dot (.) as the decimal separator.

Results
Hole
Parameter	Value	Unit
Designation	---	—
Hole upper deviation	---	μm (0.001 mm)
Hole lower deviation	---	μm (0.001 mm)
Maximum hole size	---	mm
Minimum hole size	---	mm

Supplements

Reference

ISO 286-1 (2010) Geometrical product specifications (GPS) – ISO code system for tolerances on linear sizes – Part 1: Basis of tolerances, deviations and fits.
ISO 286-2 (2010) Geometrical product specifications (GPS) – ISO code system for tolerances on linear sizes – Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts.
ANSI/ASME B4.2 (1978) Preferred Metric Limits and Fits.