7x7 and 7x19 are two of the most common aircraft cable constructions used in aircraft controls. However, their functionality is not limited just to the aerospace industry, as these flexible cables are useful for a wide range of other mechanical applications. Available from stock in stainless steel and galvanized steel, these versatile products offer an effective balance of strength and flexibility. Take a brief moment to learn all about the characteristics of their individual constructions.
Wire Count & Performance
7x7 aircraft cable is made from 7 strands that each contain 7 wires, for a total of 49 wires. A 7x19 aircraft cable is made from 7 strands that each include 19 wires, for a total of 133 wires. This means a 7x19 construction consists of over 2.5 times the total number of wires as a 7x7. The difference in wire count imparts different properties to the finished cable. Why is this important?
In general, the more wires a cable has, the smaller the individual wires within the same diameter. This is important because the size of the wire affects the life of the wire. Smaller wires can abrade faster when subjected to friction*. Corrosion can impact smaller wires faster, leading to earlier failures in a similar environment. Given this, It is important to understand the particulars of your application before selecting a certain aircraft cable construction, as each style provides its own unique benefits and features.
Flexibility and Versatility
Different wire counts, and the corresponding wire sizes, also provide different flexibility characteristics within the same finished cable diameter. 7x7 and 7x19 cables are both relatively flexible, especially when compared to products such as 1x7 strand. Their higher wire counts allow them to bend more easily, which also makes them a more effective choice for pulley systems than strand. However, there are still additional flexibility performance differences between 7x7 and 7x19 constructions that are worth discerning before purchase. In general, the higher wire count of a 7x19 typically makes it a better choice for winches, garage doors, and other applications that require tighter and more frequent turns, while the rigidity of a 7x7 makes it a good choice for automotive and aircraft controls. Consider using a 7x19 construction when fatigue is a primary concern, and a 7x7 construction when extreme flexibility is not required.
*Keep in mind that some of the concerns noted above can be mitigated through selecting lubricated cables, such as out military specification cables, to help reduce the friction created during the normal workings of an aircraft cable.
If you need help determining which cable construction is best suited for your needs, our wire rope craftsmen are happy to help. To learn more about our aircraft cable, visit https://strandcore.com/products/aircraft-cable/ or contact us with any questions.