A threaded rod, also known as a stud, is a relatively l […]
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. Threaded rod in bar stock form is often called all-thread. Threaded rod always Used in plumbing, contracting, and maintenance applications, threaded rods are used to join together and stabilize objects and structures made of wood, metal, and concrete.
For studs that are not completely threaded, there are two types of studs: full-bodied studs, and undercut studs. Full-bodied studs have a shank equal to the major diameter of the thread. Undercutstuds have a shank equal to the pitch diameter of the screw thread. Undercut studs are designed to better distribute axial stresses. In a full-bodied stud the stresses are greater in the threads than in the shank.
Undercut studs (rolled thread) are also stronger because the metal is "rolled" up to the major diameter, not removed. This preserves the grain of the steel, and in some cases even enhances it. Full bodied studs (cut thread) are weaker because metal is removed to create the thread, disturbing the grain of the steel.
Undercut studs are only required in applications where the stud is exposed to fatigue. Cut threads are entirely suitable for many applications, even when rolled threads might be slightly stronger. Mass-produced fasteners (standard bolts and studs) are usually rolled, but jobbed parts with custom features and small lot sizes are likely to be cut.
Metric threaded rods are marked on the end with a color code to define the ISO strength class. The color codes are: Unmarked — 4.6 class (tensile strength = 400 N/mm2, yield strength 240 N/mm2);Yellow — 8.8 class (800 N/mm2, 640 N/mm2);Green — A2 stainless steel (304);Red — A4 stainless steel (316);White — 10.9 class (1000 N/mm2, 900 N/mm2).