Join Date: Mar 2007
Location: Ontario, Canada
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That looks like metal fatigue. For the steel to actually break like that; it was manufactured with too brittle.
The other thing I noticed was that on the first image, there seems to lack a sign of a washer. It actually looks like there is an "indentation" on the right piece above the slot. This may have been caused by the lack of a washer and the nut denting(fracturing) the metal structure causing the failure. Perhaps the nut was tightened too much.
From the sound of what others are posting here; there may be a problem with the metal make-up.
'03 Silver SL AWD w/Sunroof - SOLD
Original Alternator (Just got the NEW recall Alt :-)
Air Lift Rear Suspension
Thule Roof Rack system
'07 Volvo XC90 V8 AWD
18" Crome Wheels