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For the fit, the dimensional relationship of two workpieces of identical nominal dimension and subject to tolerances is designated, the tolerance fields of which, however, can differ in position and size. The permissible nominal dimensions are defined through fits, for example for holes and shafts that are to be connected to one another. The corresponding fundamental tolerances and limit values are thereby established in ISO 286-1:2010 und ISO 286-2:2010.
Fits always consist of three pieces of information:
- Nominal dimension: Nominal dimension for the diameter of the hole or the outer diameter of a shaft.
- Degree of tolerance: marked with numbers from 01-18. The smaller the number, the smaller the tolerance field.
- Tolerance position: Designated with the letters A - ZC. Describes the position of the tolerance field. The farther a letter is from A, the tighter the fit.
The following types of fits thus arise:
- Clearance fit (maximum shaft dimension is always smaller than the minimum dimension of the hole)
- Interference fit / press fit (minimum dimension of the shaft is always greater than the maximum dimension of the hole)
- Transition fit (depending on the attained nominal dimensions, either clearance fit or interference fit)
Our online fit calculator not only calculates the maximum tolerated dimensions for a given nominal dimension and type of fit but, as the first fit calculator, also does the reverse. This can be helpful on drawings when, in addition to the nominal dimension, the tolerance variations alone are indicated. If the inner and outer fit are specified, the fitting type is additionally output and visualized.