These carriage bolts are designed for heavy-duty applications, featuring a 5/8" diameter and a 11 threads per inch coarse thread. They are 8 inches long with a 6 inch under-sized thread, making them ideal for use in situations where a standard thread length is required, but a shorter under-size is necessary for proper fit. Made from A307 Grade A material, these bolts are durable and reliable, suitable for a variety of construction and industrial projects. The hot-dipped galvanized (HDG) finish provides added resistance to corrosion, making them suitable for both indoor and outdoor use.