Carriage bolts, Coarse (standard) thread, 20

A corrosion resistant steel alloy. The most common stainless steel for general hardware use.

A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments.

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. A low carbon steel for general use. Zinc plated for moderate corrosion resistance.

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.

A low carbon steel for general use. Chrome plated and polished for a mirror like finish.

A low carbon steel for general use. Hot dipped galvanized is a coating for very good corrosion resistance.

Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.