According to the rabbinical tradition, there are 8 threads in each side of the Tzitzit.
How many threads in the 'Tzitzit' of Karaites?
According to the rabbinical tradition, there are 8 threads in each side of the Tzitzit.
How many threads in the 'Tzitzit' of Karaites?
From this image on the website of the World Karaite Organization, it seems that each side has two cords: one white and one blue.
Based on this video, it looks like each cord is made up of four strings, much like the rabbinical tzitzit.
For more info on the subject and process:
http://www.theancientsblue.com/tying-tzitziot.html
as far as I know there is no "required" number of threads. Most of the ones in my possession have 4 blue and 4 white threads. (Maybe all of them.)
In case anyone is interested, I have a learning on techellet (thought it does not touch on the number of threads). https://youtu.be/sI-sBMn7wSk?t=1387