Corresponds to the maximum bolt grade the nut can be paired with.
Specific ranges for different strength classes (e.g., Classes 5, 6, 8, 10, and 12). gost r 52628 2017 skachat pdf
💡 Always verify that you are using the most current "Active" (Действует) version, as standards are periodically updated or replaced by interstate versions (GOST ISO). Corresponds to the maximum bolt grade the nut