Metric ID Markings AALL American Bolts amp Screws amp Other
2016 6 21 nbsp 0183 32 Metric Bolt Grades Metric Bolt Classes Bolt Grade Markings and strength chart Metric bolt tensile strength Metric Bolt Identification Bolt class 4 6 Bolt class 5 8 Bolt class 8 8 Bolt class 10 9 Bolt class 12 9 Common Metric Steel Bolts Identification Mark Material Tensile Strength Minimum Yield Strength Minimum Proof Load Hardness Min Max