BCarriage Bolt, Hex Bolt, olts are used in conjunction with nuts. With different heads, the bolts can be hex bolt, flange bolt, carriage bolt and anchor bolt etc.. The material can be steel or stainless steel. For the steel type, there’re class 4.8, 8.8, 10.9 or 12.9 and the finish can be self-color, black oxide or galvanized.