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PHOTO CREDIT: Ronstan International Pty Ltd

1 X 19 construction

19 SINGLE STRANDS

  • Strongest
  • Lowest stretch
  • Least flexible

7 X 19 CONSTRUCTION

7 STRANDS OF 19 WIRES

  • Flexible

7 X 7 CONSTRUCTION

7 STRANDS OF 7 WIRES

  • Semi-flexible
  • PVC coated (optional)


STRETCH IN WIRE

Stretch is a characteristic of all wire, initially as permanent stretch when the load is first applied and the individual wires bed down, and then as conventional elastic stretch within the wires as load increases. Where stretch is critical to the application, initial stretch can be accounted for with cables stretched (pre-stressed) during swaging and cable manufacturing. Elastic stretch can be estimated by the following formula:

where:
W = Aplpied load (kN)
L = Cable length (mm)
E = Strand modulus (kN/mm2)
A = Metallic Cross Sectional Area (mm2) as indicated in the tables below.


Typical values for E are:

1 x 19 127 kN/mm2 (18.42 x 106 P.S.I)
7 x 19  97.1 kN/mm2 (14.08 x 106 P.S.I)
9 x 19  106 kN/mm2 (15.37 x 106 P.S.I)