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ISO 4161:2012
Hexagon nuts with flange, style 2 - Coarse thread
ISO 4161:2012 specifies the characteristics of hexagon nuts with flange (style 2), with metric coarse threads from M5 to M20 inclusive, of product grade A for threads up to and including M16 and product grade B for threads above M16.
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International Organization for Standardization [iso]