LIMITS, FITS AND TOLERANCES CALCULATOR (ISO SYSTEM)
Limits, fits and tolerances calculator was developed to calculate 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 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.

Calculator:
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:

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