Originally Posted by
taras0000
You're ok if the first 3-4 threads are engaged. This is where most (roughly 90%) of a threads holding power is, even on deeper engagements. Ideally, you want minimally 1-2 threads showing past the nut. This is the standard minimum for bolted connections in the industrial world.
Also, is it a new axle? and are the thread engagements the same on the other side? If it's short on both sides, methinks that maybe they installed a bolted track axle on a road width hub, since it's a conversion. In other words, the axle is too short by ~3mm on each side.
I agree with the above. However, we could help you out better if you showed both sided. Are there two nuts on the other side? This is strange. You may just need to have the axle adjusted so it is even on both sides with one nut. Perhaps something is wonky with the axle and it will only work when pushed to one side. Send a picture of the other side please.