The Evolution of Triangular Strand Ropes

Almost 200 years of history means a vast amount of experience. Through its valuable experience and its pioneering technologies Redaelli, an internationally recognized manufacturer for hi-tech steel wire ropes, developed 7-MINE, a state-of-the-art product for underground mining applications.

7-MINE is an innovative 7 strand rope that offers maximum comfort, the highest possible safety and minimal wear that guarantee longer operational lifetime than the traditional triangular strand ropes.

Its improved design avoids the most common problem of triangular strand ropes such as indentation and core collapse. The Lang’s Lay construction and the 7 outer compacted strands improve the roundness of the rope, consistently reducing vibrations, as shown by specific lab tests carried out on purpose.

The improved roundness and the increased outside surface allow a better distribution of pressure on contact surfaces, reducing significantly the wear of the rope. Moreover, compacted strands increase the outside surface, also simplifying visual inspections.

7MINE has an improved radial stiffness that increases significantly rope stability. The steel strands of the core are separated by polypropylene at 120° angles. Plastic coating of the core assures the stability of the rope.

Linear mass and breaking force of 7-MINE are the same of triangular strand ropes. Therefore 7-MINE can be installed in the same winches where triangular strand ropes are installed, without modify the existing equipment. 7-MINE rope can also be customized to meet specific clients’ requirements.

7-MINE ropes are presently installed in mines in North America, South Africa and the Far East. For further information on 7-MINE rope pls. contact Redaelli at

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