This standard specifies the hexagonal nuts with thread specifications M5~M64, performance grades 4 and 5, and product grade C. If other technical requirements are required, they should be selected from current standards (such as GB/T 196, GB/T 3098.2 and GB/T 3103.1).
GB/T 41-2000 history
2016GB/T 41-2016 Hexagon nuts,style 1.Product grade C