All threaded rod is head, the whole product is thread.A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. They are designed to be used in tension. A threaded rod, also called a stud bolt , is a relatively long rod that isthreaded on both ends; the thread may extend along the complete length of the rod. They are designed to be used in tension.Threaded rod in bar stock form is often called all-thread.Material: carbon steel 4.8, carbon steel 8.8, 10.9 , 12.9 High Strength Zinc Plated Metric Full Threaded Rod, Threaded rod in bar stock form is often called all-thread.