Surface tolerances

Surface tolerances are guide values for permissible deviations from the required quality. In addition to surface tolerances, dimensional and shape deviations in particular are specified in practice.

The measure for the respective permissible deviation is usually derived from generally recognized standards, but it can also refer to individual agreements between contractual partners.

Surface tolerances can indicate, among other things, the permissible degree of these types of deviation:

  • Offset
  • Ridge
  • Notch
  • Deburring area
  • Collection points
  • Flow lines

The surface quality of shaping tools and their positioning in relation to each other can be responsible for surface deviations. The cause may also be due to the precision of the machining or subsequent production steps.

#1 Definition of surface tolerances

Surface tolerances specify the maximum permissible dimension for various types of surface deviation.

#2 Significance of surface tolerances

In sealing technology, the surface finish plays an important role in ensuring the tightness of connections. The surface quality of the sealing surfaces and the sealing element itself must be sufficient to prevent leakage, for example due to unsealed longitudinal grooves. 

Surface tolerances are therefore a functionally relevant criterion.

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