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This International Standard specifies terms and definitions commonly used in the metal springs industry. Specifically, these terms appear in technical product documentation. Heat-treatment and surface-treatment terms pertinent to springs are included.Terms are grouped into the following seven categories: a) general features of springs; b) application of springs in machinery and engineering; c) layout and nomenclature of springs; d) specification requirements; e) design and calculation; f) manufacturing and processing; g) testing and inspection. The hierarchical structure of terminology in each category is given in Annex B.