ISO 657

ISO 657 (Hot-rolled steel sections) is an ISO standard that specifies the tolerances for hot-finished circular, square and rectangular structural hollow sections and gives the dimensions and sectional properties for a range of standard sizes.

This first edition as an International Standard constitutes a technical revision of ISO Recommendation R 657-1:1968. ISO 657 consists of 21 parts integrating any shapes of sections. ISO 657-1 specifies dimensions of hot-rolled equal-leg angles.


  • ISO 657-2:1989
  • ISO 657-5:1976
  • ISO 657-11:1980
  • ISO 657-14:2000
    • Revisions
      • ISO/DIS 12633-2
      • ISO 657-14:1982
  • ISO 657-15:1980
  • ISO 657-16:1980
  • ISO 657-18:1980
  • ISO 657-19:1980
  • ISO 657-21:1983


List of International Organization for Standardization standards, 1-4999

This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.

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