Carriage Bolts
Carriage bolts are primarily used in wood applications such as decks, docks, and swing sets.  They can be used on other machinery and equipment.  Grade A carriage bolts are mainly for light duty applications.  The round head offers a smooth finish while the square neck underneath the head offers a secure connection when tightening a nut onto the bolt.  Zinc is the most common finish, but these are also offered in plain and galvanized coating.