1-6-12 (Two Layer Construction)
Two Layer is constructed of 19 wires (1+6+12). This is used for 1x19 Strand (Stranded wire) and 7x19 Multi Strand wire rope (cable). The first layer consist of 6 wires twisted to the right around a single straight center wire. These 7 wires become the inner core of the strand. The second layer applies a series of 12 additional outer wires twisted around the inner wires in an opposite (left) direction. Two layer construction is a complete Strand for 1x19 Strand and 7x19 Wire Rope only. 7X7 cable does not use Two Layer construction! Remember "1x19" means 1 Strand and 19 Wires. On 7x19 cable there are 6 of these strands twisted around a center strand making a total of 7 strands of 19 wires each for a total of 133 wires. (click on drawing for larger view)
1-6 (One Layer Construction)
One Layer is constructed of 7 wires (1+6). This is used for 7x7 Multi Strand wire rope . This construction is identical to Layer One of two layer construction with a variation in twist directions (see drawing). 7x7 multi strand wire rope (cable) uses a right twisted one layer construction as the inner core strand and 6 identical additional strands twisted left for the outer strands. This creates a total of 7 strands each having 7 wires for a total of 49 wires when completed. (click on drawing for larger view)
