A full thread bolt with a six sided head.
The most common stainless steel for general hardware use.
A low carbon steel for general use, either Grade 2 or A307A. Zinc plated for moderate corrosion resistance.
A tempered medium carbon steel. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications. Zinc plated for moderate corrosion resistance.
Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.
A general purpose nylon often used in fasteners for corrosion resistance.