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Zinc plated for moderate corrosion resistance. A tempered medium carbon steel. Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8.
For adding a machine thread to material that otherwise can not be tapped.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.