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Mike Noc · 17th October 2020, 08:31

All I can think of is that the rim of the inner race of the bearing is quite narrow and it is hardened steel, so if the washer was to turn against it then the washer could pick up and get damaged as the tightening torque is quite high. Also being a small contact area there is less friction between bearing and washer, so it would be more likely to loosen at this point. The shoulder of the nut is far wider where it contacts with the washer.

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17th October 2020, 08:31	#4
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,548 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	All I can think of is that the rim of the inner race of the bearing is quite narrow and it is hardened steel, so if the washer was to turn against it then the washer could pick up and get damaged as the tightening torque is quite high. Also being a small contact area there is less friction between bearing and washer, so it would be more likely to loosen at this point. The shoulder of the nut is far wider where it contacts with the washer. . Last edited by Mike Noc; 17th October 2020 at 11:09..