Originally Posted by biffer
by the time you've wound them down the stub axle they're round again anyway, wind it on tight and use a hammer and centre punch to put a dent right on the edge of the nut that will distort it enough not to unwind, total bollox about harming the bearing, the bearing is or was the same as a vauxhall cavalier rear wheel
250lbft is pretty tight, but i cant see it distorting the inner race if its overtightened, unless the bearings are made of chocolate
stub axle would stretch first. its just their way of making sure total muppets dont reuse knackered nuts with no locking device.