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Cut vs. Rolled Threads

cutandrolled

  • Rolled threads, extruded by dies, are stronger than cut threads, made on a lathe or with a hand die, because their grain flows in more than one direction, following the contour of the fastener.
  • So you shouldn’t re-cut the threads of a roll-threaded fastener. (Re-cutting may also affect heat treatment and plating. And when you re-cut, you lose about two threads because there’s not enough material on the taper between the threads and the shank.)
  • Also, rolled threads are smoother than cut threads, so there are no high spots to prevent proper torquing or allow loosening.
  • It takes a lot more labor to cut threads than to roll them, so it’s more costly.
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