I used the terms "swaged wire rope end fittings" as it's reasonably clear that there's wire rope involved. The crimping on the fitting is called swaging and the rest was up to The Google.
Most of the returns were incorrect. Perhaps the terms aren't the best, but at least one manufacturer used them for their product.
Another term that came from expanding the search is wire rope threaded end or wire rope threaded stud, although that's somewhat redundant.
The images that return from the search show both rotary swaging and bolt-cutter-type swaging and some with none at all, as seen in the drawing above.
I would expect that to enable tightening of the wire rope, one would desire a left-hand thread at one end and a right-hand thread at the other, or else one would have to pre-wind the opposite direction, then insert the stud into the fitting.
The wires do indeed go to the sprinkler system. There turned out to be a 4th white wire I hadn't yet uncovered. The two sets provide the current to open control valves for the two zones on the other side of the driveway.
I finally got input from a professional sprinkler repair company. They were baffled at first, because the pipes appear to go all the way around the house. The sprinkler guys finally decided that those had to be stubbed extensions for adding a zone to the backyard. Additionally, the wires turn under the drive at a different point than the actual water supply pipe.
Finally, I didn't detect the problem because there was another long standing problem with the zone they supplied that prevented it from getting water pressure.
The chain link fence folks have all kinds of fence post caps that could be used to keep the rain out. Also there are nylon caps for EMT. You could convert the tubing to iron pipe threads and install threaded PVC caps. As to the holes and lacing the cable, before installing poles, I would put them on the drill press and pre-drill.
Best Answer
I used the terms "swaged wire rope end fittings" as it's reasonably clear that there's wire rope involved. The crimping on the fitting is called swaging and the rest was up to The Google.
Most of the returns were incorrect. Perhaps the terms aren't the best, but at least one manufacturer used them for their product.
Another term that came from expanding the search is wire rope threaded end or wire rope threaded stud, although that's somewhat redundant.
The images that return from the search show both rotary swaging and bolt-cutter-type swaging and some with none at all, as seen in the drawing above.
I would expect that to enable tightening of the wire rope, one would desire a left-hand thread at one end and a right-hand thread at the other, or else one would have to pre-wind the opposite direction, then insert the stud into the fitting.