Advantages of having different CW and CCW threads
So why have 2 different shaft threads and making it so confusing?
They call this ‘Self-locking’ because on a quadcopter we have 2 motors spinning clockwise direction and the other two spinning counter clockwise. By using threads that are the opposite to motor spin direction, the prop nuts automatically lock themselves down and won’t come loose.
Identify CW and CCW Threads
So basically if you can fasten the prop nut clockwise, then you have a CCW motor, for which you should get the Right handed thread nut (standard thread).
For CW motors, go for the Left-hand thread nuts (reverse thread)
|CW and CCW