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These bolts are all partially threaded. Shorter lengths are found with full thread.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance. A tempered medium carbon steel. Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in automotive applications. Class 8.8 is similar to grade 5.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.