Definition and Classification of Threaded Rod

  • Release date:06-12-2016
  • Abst:

    A threaded rod which is also called as stud is relative […]

    A threaded rod which is also called as stud is relatively a long-sized rod that is threaded at both the ends. The thread is extended along whole length of the rod and is especially designed to be used in tension. These rods are highly versatile in nature when considering their applications.

    They are used in diverse applications such as domestic, commercial as well as other industrial applications. The main reason for preferring these rods are their adaptability and immense usefulness. As seen, these rods are completely threaded and those which are not, there are two different types for it!

    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. Undercut studs 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 Threaded Rod features and small lot sizes are likely to be cut.