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Bolt Strength Grade Comparison 4.8 8.8 10.9 12.9 Mechanical Performance Guide
bolt Strength Grade Analysis and Application Guide
Strength grade is the key index for industrial bolts. Choosing proper grade can avoid deformation and fracture under different load conditions.
Performance Comparison
| Grade | Material | Tensile Strength | Heat Treatment | Application |
| 4.8 | Carbon Steel | 400MPa | No | Light equipment and common brackets |
| 8.8 | High Quality Carbon Steel | 800MPa | Quenched & Tempered | General industrial machinery |
| 10.9 | Alloy Steel | 1000MPa | Full heat treatment | Construction machinery, vehicle parts |
| 12.9 | High Strength Alloy Steel | 1200MPa | Deep heat treatment | Heavy machinery and high pressure structures |
Summary
We supply full range bolts from grade 4.8 to 12.9. All products are manufactured according to national standards with strict quality inspection, suitable for various industrial assembly projects.