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Oct, 26
Bolt grades 8.8 vs 10.9 vs 12.9: what the numbers on the head mean
Bolt grades are the two numbers stamped on the head of a metric bolt, and together they tell you how strong it is. Multiply the first number by 100 to get the nominal tensile strength in MPa. The second number tells you what fraction of that the bolt can carry before it starts to stretch […]