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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).
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. Unplated finish.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.