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AS 1112.1:2015
ISO metric hexagon nuts - Style 1 - Product grades A and B (FOREIGN STANDARD)
Adopts ISO 4032:2012 to specify dimensions, tolerances and material requirements for hexagon regular nuts (style 1), with threads from M1.6 up to and including M64, with product grade A for threads D = M16 and product grade B for threads D > M16.
Standards Australia [sai]