Threaded Bar

With respect to shape, stud bolts a.k.a. studs are categorized into three basic types: "fully threaded stud bolts", "tap end stud bolts", and "double end stud bolts". Each of these studs have different application. As name suggests, fully threaded studs have full body coverage with threads for full engagement of the matings nuts or similar parts. Tap end studs have threads at extreme ends of the body with unequal thread engagement length, while double end stud bolts have equal thread length at both ends. Apart from these there are stud bolts for flanges which are fully threaded studs with chamfered ends, and double end studs with reduced shank for special bolting applications. 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 custom features and small lot sizes are likely to be cut.

Standard : DIN 975

Size : M8, M10, M12, M16, M20, M22-M48

Grade : A2-70, A4-70, A4-80

Material : Material

Featured snippet from the web : Threaded rod is produced from a variety of materials. The most common material for threaded rod is steel, spanning a variety of alloys, strengths, and hardness. Steel threaded rods can be coated or uncoated, with zinc being a common coating for electro-plated and hot-dip galvanized threaded rod.