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If my memory is correct both the US and Metric bolts are graded with a number whereas the higher the number the stronger the bolt. Some of the more common metric grades are 5.8, 8.8, 10.9 and 12.9. This link will give you some help, and it explains sizing but not hardness. https://www.insight-security.com/get-to-know-metric-bolt-sizes I would guess the 10 ...


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