What classification of rope usually has seven wires per strand?

The classification of rope that typically features seven wires per strand is indeed characterized by the format '6 x 7'. In this type, the first digit indicates the number of strands, while the second digit refers to the number of wires in each strand. Thus, the '6' tells us there are six strands, and the '7' specifies that each of those strands contains seven individual wires.

This structure is commonly found in ropes that require flexibility and strength, making them suitable for various rigging applications. The configuration of six strands with seven wires each helps to enhance the overall durability and load-bearing capacity of the rope, which is critical in industrial settings where reliability is paramount.

The other classifications mentioned, such as '4 x 6', '6 x 6', and '8 x 7', represent different arrangements of wires and strands, resulting in differing characteristics in flexibility, strength, and suitability for specific tasks. For example, a '6 x 6' rope would have fewer wires per strand compared to the '6 x 7', which can affect its performance in load handling situations.