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What is a Threaded Rod?

What is a Threaded Rod?

A threaded rod, is also known as a stud, is a comparatively long rod that is threaded on both ends the thread can extend along the complete length of the rod. They are created to be used in tension. Threaded rod in bar stock form is generally called as all thread.

Fully threaded rods and fully threaded studs are the fasteners with threads running their entire length for full engagement of nuts or other the female threaded components. Threaded rods, are also known as all thread rod (ATR) or thread full length rods (TFL), offer high grip strength and evenly distributed tension when mounting and securing components. These fasteners are appropriate for use in a variety of general-purpose applications, including electrical, plumbing, maintenance, and fabrication.

Types

With respect to shape, stud bolt also known as studs are categorized into three basic types: "fully threaded stud bolt", "tap end stud bolt", and "double end stud bolt". Each of these studs have different implementation. As the name indicates, fully threaded studs have full body coverage with threads for full engagement of the mating’s nuts or similar parts. Tap end studs have threads at the extreme ends of the body with unequal thread engagement length, while the double end stud bolts have equal thread length at both the ends.

Apart from these there are stud bolt for flanges which are fully threaded studs with the chamfered ends, and the double end studs with reduced shank for special bolting implementations. For the studs that are not completely threaded, there are two types of studs: full-bodied studs, and undercut studs. Full bodied studs have a shank which is equal to the major diameter of the thread. Undercut studs have a shank which is equal to the pitch diameter of the screw thread.

Undercut studs are created to better distribute axial stresses. In a full bodied stud the stresses are greater in the threads than as compared to the shank. Undercut studs or rolled thread are also stronger because the metal is "rolled" up to the major diameter, and not removed. This maintains the grain of the steel, and in some cases even improves it. Full bodied studs or cut thread are weaker because metal is removed to make the thread, disturbing the grain of the steel.

Undercut studs are only required in implementations where the stud is exposed to fatigue. Cut threads are entirely appropriate for many implementations, even when rolled threads may be slightly stronger. Mass produced fasteners (standard bolts and studs) are generally rolled, but jobbed parts with custom features and the small lot sizes are likely to be cut.

Class

Metric threaded rods are marked on the end with a color code to describe the ISO strength class.
· 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)

If you want quality Industrial fasteners for your business, you can call us at +971-506349042, +971 6 575 1335. Email us at sales@clmet.com/info@clmet.com for ordering industrial fasteners.

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