Bolts are the most commonly used parts in automobiles, because all automobile mechanical parts require bolts. We often see the words 4.8\8.8\12.9 on car bolts. In fact, these are the marks of bolt strength grades. The strength grades of bolts refer to the performance grades of bolts used in steel structure connections. Commonly they are grades 4.8, 8.8, 10.9, and there are more than 10 levels including 12.9 level in toyota calya.
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