On fasteners... when I am teaching workshops I always stress that SA wheel nuts are soft and cannot be over torqued as they will strip and much of the holding power comes from those very toothy SA lock washers.
A nut is easy to replace while changing out an axle in an IGH because you stripped the threads is a little more work... the proprietary nature of the SA nuts means folks cannot swap them for harder ones.
They should also be oiled prior to removal as if they are seized they can also be stripped quire easily... the new SA hubs also have the same hardened axle and softer nuts.