ISO 2020-1-1997 pdf download.Aerospace一Preformed flexible steel wire rope for aircraft controls – Part 1: Dimensions and loads.
6 Ropes
6.1 ConstructIon
Wire ropes covered by this part of ISO 2020 are of the two types of construction shown in table 5.
6.1.1 7 x 7 construction
This type of wire rope shall be composed of six outer strands each of seven wires laid in a tight-hand direction around a steel centre strand of seven wires.
The steel centre strand shall be composed of a layer of six wires laid in a tight-hand direction around a core or king wire. It shall be of sufficient diameter to give full support to the outer strands.
The six outer strands shall be composed of a layer of six wires laid in a left-hand direction around a core or king wire. The lengths of lay shall be as follows:
a) the six outer strands shall be laid around the steel centre strand with a length of lay between six and eight times the nominal diameter of the rope;
b) the lengths of lay of six wires of the steel centre strand and of the outer strands shall not exceed 80 % at the length of lay of the rope.
6.1.2 7 x 19 construction
This type of wire rope shall be composed of six outer strands each of 19 wires laid in a right-hand direction around a steel centre strand of 19 wires.
The steel centre strand shall be composed of a first layer of six wires laid in a right-hand direction around a core or king wire, and a second layer of 12 wires laid in a right-hand direction. It shall be of sufficient diameter to give full support to the outer strands.
The six outer strands shall be composed of a first layer of six wires and a second layer of twelve wires laid in a left- hand direction around a core or king wire.ISO 2020-1 pdf download.