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Background: Important facts about strands, ropes, and cables
Wires are individual “threads” of steel or other metals. They are usually twisted in a spiral to form a strand or a rope (comprising several strands) – if they are made of wire, they are called cables. Twisting of several wires into a strand or rope provides flexibility and increases load capacity. Steel cables were invented in Germany in 1834. They are classified to DIN EN 12385 (based on the number of strands multiplied by the number of wires per strand, e.g., 8 x 9). MCT offers all common classes on a quality standard “made in Germany”.
Background: Directions and types of lay
Several wires are twisted together to form a strand, several strands in turn to form a rope. The direction of lay is decisive for production (and partly also for use):
Direction of lay
The direction of lay can be told from the helix of the outer strands.
The direction of lay is right-handed (abbreviation: z) or left-handed (abbreviation: s) and always refers to the outer layer.
Ordinary lay: The direction of lay of the strands in the rope is opposite to the direction of lay of the wires in the strand.
Lang lay: The direction of lay of the strands in the rope is the same as the direction of lay of the wires in the strand.
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