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.

Supplements:

Link Usage
Preferred fits and tolerances charts (ISO) Preferred metric fits advised by ISO 286-1 (2010) and ANSI B4.2 (1978) standard are given to help user about the selection of fit. Whenever possible, selection of tolerance class shall be done among these tolerances to avoid too many numbers of tools and gauges.
Interference (press & shrink) fit calculator The calculator which calculates press fit force, required temperatures for shrink fit, fit stresses and other parameters necessary for interference fit design
Precision Measuring Tools For Shaft and Hole Measurements Devices that can be used for the measurement of the inside diameter of the hole and outside diameter of a shaft

Other Languages:


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