CIRP Encyclopedia of Production Engineering

Living Edition
| Editors: The International Academy for Production Engineering, Sami Chatti, Tullio Tolio


  • Robert SchmittEmail author
Living reference work entry

Latest version View entry history



A form tolerance that prescribes the largest possible deviation of a circle from its geometrical ideal form (Pfeifer and Schmitt 2010). The roundness tolerance determines that in each section perpendicular to the axis of a toleranced cone-formed element, the actual profile, or the actual contour line, must lie between two concentric circles within the same plane, which are at the distance of the tolerance value. For sphere-formed elements, this tolerance is valid for each intersection through the center.

Theory and Application

The sample workpiece has a drill hole for the bearing with a roundness tolerance of 0.01 mm (Fig. 1). Roundness tolerances can also be used for arcs of circles with less than 360° coverage (Pfeifer and Schmitt 2010).
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  1. DIN EN ISO 1101 (2014) Geometrical product specifications (GPS): geometrical tolerancing – tolerances of form, orientation, location and run-out. Beuth, BerlinGoogle Scholar
  2. Pfeifer T, Schmitt R (2010) Fertigungsmesstechnik [Production metrology], 3rd edn. Oldenbourg, München (in German)Google Scholar

Copyright information

© CIRP 2018

Authors and Affiliations

  1. 1.Laboratory for Machine Tools and Production Engineering WZLRWTH Aachen UniversityAachenGermany

Section editors and affiliations

  • Eric Lutters
    • 1
  1. 1.University of Twente, Faculty of Engineering Technology Laboratory of Design, Production and ManagementEnschedeThe Netherlands