the nut just keeps the sprocket in place axially speaking, it doesnt help transmit any of the torque, the splines do that. other bikes have some times just a slotted plate keeping the sprocket in place, not even a nut pressing...
as long as you used the locking washer so the nut cant unscrew, you are good.
on my race bikes where i change sprockets often, i have the nut drilled so i can use safety wire instead of a new washer every time. i snug them up with a wrench but the nut is always hand tight when i have to remove it.
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