This part of GB/T 802 specifies the characteristics of welding type acorn hexagon nuts with flange with threads from M4 to M24,with property classes 6,8 for steel,and grade and property class symbols A2-50,A2-70,A4-50,A4-70 for stainless steel,and with product grades A and B. For D≤16 mm,product grade A; for D>16 mm,product grade B.
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