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Flange bolts are machine threaded for use with a nut. They have a flange under the head that acts like a built in flat washer.
A hexagonal head for use with a wrench. These bolts are sometimes called Frame bolts. Meets DIN 6921 (1983).
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.
A hexagonal head for use with a wrench. Meets DIN 6921 (1983). Serrated heads are designed to prevent loosening.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.