Low-Rotation Wire Rope

A certain amount of rope spin is natural during the operation of most cranes.  This should be kept to a minimum as excessive rotation can cause serious fatigue.  On single-fall cranes, the damaging effect of spin can be reduced by installing a free-moving ball bearing swivel between the rope and the load.  In cases where spin is particularly troublesome it is often advisable to change to a low-rotating construction.

A low-rotation or an anti-twist wire rope consists of an inner layer of strand laid in one direction covered by a layer of strand laid in the opposite direction.  This has the effect of counteracting torque by reducing the tendency of the finished rope to rotate.