LIMITS, FITS AND TOLERANCES CALCULATOR (ISO SYSTEM)
Limits, fits and tolerances calculator has been developed to calculate engineering tolerances of inner and outer features of journal bearings, linear bearings, thrust bearings, bushings, ball bearings, roller bearings, housings, cylinder bores, drilled holes, linear and precision shafts, pistons, etc. The calculator works in line with ISO 2861 (2010), ISO 2862 (2010) and ANSI B4.2 (1978) standards which are based on metric units. According to the input parameters of nominal size and hole/ shaft tolerances, size limits and deviations for hole/shaft are calculated and fit type is selected among the clearance, transition and interference fits. The schematic representation of the fit is also drawn. The preferred tolerances and fits advised by ISO and ANSI standards can be found in the "Supplements" section.
The tolerances defined in ISO 2861 (2010) are applicable to size range from 0 mm to 3150 mm but there are a lot of 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.
Note: For more information on metric limits and fits including definitions, designations, symbols, preferred metric fits, fundamental deviations and calculation of limits of tolerance, please refer to pages 648 – 671 of the
Machinery's Handbook, 29th.

Calculator:
 Parameter
 Nominal Size
 Hole Tolerance
 Shaft Tolerance
Note : Use dot "." as decimal separator.
 Parameter
 Designation
 Hole Upper Deviation
 Hole Lower Deviation
 Maximum Hole Size
 Minimum Hole Size
 Value
 
 
 
 
 
 Unit
 
 μm(0.001mm)
 μm(0.001mm)
 mm
 mm
 Parameter
 Designation
 Shaft Upper Deviation
 Shaft Lower Deviation
 Maximum Shaft Size
 Minimum Shaft Size
 Value










 Unit
 
 μm(0.001mm)
 μm(0.001mm)
 mm
 mm
 Parameter
 Designation
 Fit Type
 Maximum Clearance
 Minimum Clearance
 Unit
 
 
 μm(0.001mm)
 μm(0.001mm)
Fit Tolerance Mobile App:
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:
 Explanation
 Preferred metric fits advised by ISO 2861 (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.
 The calculator which calculates press fit force, required temperatures for shrink fit, fit
stresses and other parameters necessary for interference fit design
 Devices that can be used for the measurement of the inside diameter of the hole and outside diameter of a shaft
Other Languages:
Limits, Fits and Tolerances Calculator in German.
Limits, Fits and Tolerances Calculator in French.

Oberg,
E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) .
Machinery's Handbook
. 30th edition. Industrial Press Inc.

Oberg, E. , Jones
,F.D. , Horton H.L. , Ryffel H.H., (2012) .
Machinery's Handbook
. 29th edition. Industrial Press Inc.

IS0 2861 (2010) Geometrical product specifications (GPS)  ISO code system for tolerances on linear sizes  Part 1: Basis of tolerances, deviations
and fits
 IS0 2862 (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