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See Chinese contents: GB/T 6177.1-2016 GB/T 6177.1-2016: Hexagon nuts with flange, style 2
This Part of GB/T 6177 specifies the type and dimension, technical conditions and mark of hexagon nuts with flange, style 2. This Part is applicable to the hexagon nuts with flange, style 2 with thread specification of M5~M20, property class of 8, 10, 12 and A2-70, product grade A and B. Product grade A is applied to nuts with 16mm; while product grade B is applied to nuts with D and gt;16.
