Metric Bolt Grade Markings and Steel Strength Chart MonsterBolts
2019 11 5 nbsp 0183 32 Head Markings Metric Bolt Class Mechanical Properties Proof Load MPa Min Yield MPa Min Tensile Strength MPa Class 12 9 Alloy Steel quenched and tempered 970 1 100 1 220 Class 10 9 Alloy Steel quenched and tempered 830 940 1 040 Class 8