LIMITS, FITS AND TOLERANCES CALCULATOR (ISO SYSTEM)

Fits and tolerance calculator for shaft and hole according to ISO 286-1 and ANSI B4.2 metric standards . The schematic representation of the fit is also drawn.

The tolerances defined in ISO 286-1 are applicable to size range from 0 mm to 3150 mm but there are exceptional cases defined in the standard which depend on tolerance selection. If the calculation results given by the calculator are "---", then this means the input parameters are not applicable according to ISO standard.

Limits, Fits and Tolerance Calculator:

INPUT PARAMETERS
Parameter Value Unit
Nominal Size mm
Hole Tolerance ---
Shaft Tolerance ---
 




Note : Use dot "." as decimal separator.


RESULTS
HOLE
Parameter Value Unit
Designation --- ---
Hole Upper Deviation ---  μm (0.001mm)
Hole Lower Deviation --- μm (0.001mm)
Maximum Hole Size --- mm
Minimum Hole Size --- mm
SHAFT
Parameter Value Unit
Designation --- ---
Shaft Upper Deviation ---  μm (0.001mm)
Shaft Lower Deviation ---  μm (0.001mm)
Maximum Shaft Size --- mm
Minimum Shaft Size --- mm
FIT
Parameter Value Unit
Designation --- ---
Fit Type --- ---
Maximum Clearance --- μm (0.001mm)
Minimum Clearance --- μm (0.001mm)

Definitions:

Nominal size: The size of a feature of perfect form as defined by the technical drawing.

Deviation: The difference between a size and the corresponding nominal size.

Upper deviation: The difference between the maximum limiting size and the corresponding nominal size of a feature.

Lower deviation: The difference between the minimum limiting size and the corresponding nominal size of a feature.

Tolerance: The difference between the maximum and minimum size limits of a part.

Clearance Fit: A fit type where clearance exists between assembled parts under all tolerance conditions.

Interference Fit: A fit type where interference exists between assembled parts under all tolerance conditions.

Transition Fit: A fit type where clearance or interference can exist between assembled parts depending on tolerance conditions.

GD&T A means of dimensioning and tolerancing a part with respect to relationship and function of that part. GD&T is used to define how a part feature relates the other part features in the same part or in a mating part; it’s a way to dimension and tolerance with respect to part’s function, the way it works.

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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