A low carbon steel for general use. Zinc plated for moderate corrosion resistance. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications.
Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. A low carbon steel for general use. Unplated finish.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.