Cut threading is a process that removes steel from a round bar or rod to form threads.
Roll threading is a process where steel is pressed or extruded to form the thread, instead of being removed, as in cut threading.
When comparing roll thread and cut thread steel wire, many people believe that rolled thread products are weaker because the wire diameter is smaller. This is in fact NOT true. Since the thread dimensions of a cut thread and rolled thread fastener are identical, there is no difference in strength. However, the work that has been done on the weakest point of the root will affect the strength of the finished product. A cut thread requires no work on the base material since the thread is formed by simply removing the metal. A roll thread, however, is formed by metal displacement (cold work), so the work hardening, which occurs during the roll threading process, is what gives a rolled thread a stronger tensile strength.
Additionally, cut threading interrupts the natural grain structure of the round bar. Roll threading reforms it. Most agree that cuttng into the grain of a round bar when cut threading will product threads that have less structural integrity than a part that has been roll threaded.
Advantages of Cut Threading
Disadvantages of Cut Threading
Advantages of Roll Threading
Disadvantages of Roll Threading
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