Bolt Grade Rating
By Emmanuel Admin • December 14, 2021 Posted in Charts
| SAE Grade No. | Size Range | Tensile Strength | Material | Head Marking |
| Grade 2 | ¼” thru ¾” ?” thru 1 ½” | 74,000 psi 60,000 psi | Low or medium carbon steel. |  |
| Grade 3 | ¼” thru ¾” | 110,000 psi | Medium carbon steel |  |
| Grade 5 | ¼” thru 1” | 120,000 psi | Medium carbon steel, quenched & tempered |  |
| Grade 5.1 | ¼” thru ½” | 120,000 psi | Lor or medium carbon steel, quenched & tempered |  |
| Grade 6 | ¼” thru 1” | 140,000 psi | Medium carbon steel, quenched & tempered |  |
| Grade 8 | ¼” thru 1 ½” | 150,000 psi | Medium carbon alloy steel, quenched & tempered |  |
Bolt Grade Rating psi Chart
