A tempered medium carbon steel. Zinc plated for moderate corrosion resistance. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications.
A tempered medium carbon steel. Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. Unplated finish.
For adding a machine thread to material that otherwise cannot be tapped.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.