Volvo S40 Owner's Manual page 183

2007 Volvo S40
There are two different types of wheel nut, depending on whether the wheels are steel or aluminum.
Steel rims - low nut
Steel rims are normally secured using the low type of nut, although steel rims may also use the high type.
WARNING
Never use the short type of nut for aluminum wheels. This could cause the wheel to come
loose.
Aluminum wheels - high nut
Only the high type of nut can be used for aluminum wheels. This is considerably different from other
types of nut because it has a rotating conical thrust washer.
NOTE
This nut can also be used on steel
wheels.
Lockable wheel nut
If steel wheels with lockable wheel nuts are used in combination with wheel covers, the lockable wheel
nut must be fitted to the stud nearest the air valve. The wheel cover cannot otherwise be installed on the
wheel.
169 07 Wheels and tires
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