The performance grade of the nut varies according to different use occasions and bearing requirements, and the common performance grades are 4.8, 8.8, 10.9 and so on.
For example, the common nut grades in the ISO standard are 4, 5, 6, 8 and 10, where a class 4 nut is a low-strength general purpose nut and a Class 10 nut is a high-strength special nut.
In addition, the performance grades of the nuts used for steel structure connection are more subdivided, including 3.6.4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and other grades.
