The strength grade of the bolt

1.Strength grade of ordinary bolts
  4.6 magnitude / 5.6 magnitude / 6.8 magnitude
2.The strength grade of high-strength bolts
  8.8 grade / 10.9 grade / 12.9 grade
3.Other strength grades
  Level 3.6 / Level 9.8
4. Selection of Strength Levels
Common bolts: Suitable for general connection and fixation tasks, such as in light or medium load scenarios.
High-strength bolts: Applicable to occasions where high connection strength is required, such as in mechanical manufacturing, automotive industry and construction engineering.
Ultra-high-strength bolts: Suitable for special engineering fields, such as aerospace and military equipment, where extremely high requirements are imposed on the strength, precision and reliability of bolts.