Wire rope science

Here you will find everything you need to know about ropes and cables. What is the difference between a wire, strand and a rope? Which rope constructions do exist? What is meant by lay directions? What is the effect of stretching? What materials are available? What is a coated rope and what is it required for?

Definition wire, strand, cable

elongation wire and rope

Strands are made of single high tensile wires. These are placed helically around an insert * (heart wire) in the steel cable factory. This is the basic model for the further rope prodution.

A wire rope is produced by twisting strands. In addition to a strand (-WSC), a fiber interlayer (-FC) can also be used as the insert. In special cases, a rope (-IWRC) can also be used as an insert.

Ropes are designated as follows:
(Number of strands) x (Number of wires per strand)

Example: 6 x 7-WSC is a rope with 6 strands and 7  wires including one center strand.

Carl Stahl Technocables produces various strands and wire ropes, e.g. In our own factory at the site in Süßen. Find out more about the various rope constructions.

Rope and strand constructions

Here you will find an overview of our standard rope constructions and strand constructions and their possible applications.

We also offer numerous special constructions.

Contact us for advice

Lay direction

The lay direction indicates the direction in which the outer wires (outer strands) of the strand (cable) are laid around the center wire (core strand).

“S-lay” means: the outer wires (outer strands) are laid in left direction around the center wire (core strand).

“Z-lay” means: the outer wires (outer strands) are laid in right direction around the center wire (core strand).

Furthermore, a distinction is made between ordinary/regular lay and langs in the stranding (see figure). As standard, Carl Stahl Technocables delivers the steel cables in right hand ordinary lay (sZ).

Elongation ropes and strands

Elongation ropes and strands

Two different kinds of elongation can be distinguished:

1. Constructional elongation
After the manufacturing process of the ropes and strands, small gaps remain between each wire within the strand and between each strand in the rope. When the rope is tensioned, the wires and the strand move closer to each other, and reach their optimum position. A result of this process is, that the rope elongates to a certain extent. This constructional elongation is not the same in every rope construction. It depends on lay, lay length, rope construction and other factors.

2. Material elongation
This elongation concerns the material that the single wires are made of. It occurs, when the wire is tensioned. The material elongation is proportional to the applied load. Under normal circumstances the rope will almost regain its original length as soon as the load is removed.

Contact us directly for your individual cable solution

We can recommend suitable steel cables for your purposes.

High-quality materials for steel wire strands and steel cables

The standard wires for steel wire strands and cables are made of galvanised steel or stainless steel 1.4401/ AISI 316. Galvanised wire offers sufficient corrosion protection for many areas of use. If the steel wire cables and strands are to be used in highly corrosive media, we recommend stainless steels.

In order to meet your special cable requirements, we also produce cables using other materials. In addition to the standard materials, stainless steel and galvanised steel special materials are also used, such as the following for example:

Brass | Copper | Titanium | Tantalum | Monel | Inconel | Hastelloy

For the jewellery industry Carl Stahl TECHNOCABLES produces cables and strands in:

Gold | silver | platinum | palladium

Talk to us for your individual cable solution

Contact form