Alfa Romeo 166 wheel bolt & nut sizes
The Alfa Romeo 166 (1998–2007) uses M12x1.25 wheel fixings with a 60° taper seat and a 17mm hex. It has 5 per wheel, so a full set is 20. Check the table below for the exact fixing for your year and wheel type.
Last updated 2 October 2026
Thread
M12x1.25
Seat
60° taper
Hex size
17mm hex
Strength
Class 8.8
Sizes by year and wheel type
| Image | Model code | Wheel type | Thread | Length | Seat | Hex size | Finish | Strength |
|---|---|---|---|---|---|---|---|---|
| 1998–2007 5 per wheel | ||||||||
| 936 | Steel & Alloy Wheels | M12x1.25 | 22mm | 60° taper | 17mm hex | Delta KL100 | Class 8.8 |
A dash in the length column means no length is listed for that fixing. Not sure which wheels you have? Steel wheels usually have a plastic trim cover over them.
Locking wheel keys for the Alfa Romeo 166
Lost or damaged your locking wheel key? Find a replacement for your Alfa Romeo.
Common questions
What size are Alfa Romeo 166 wheel bolts?
Alfa Romeo 166 wheel fixings are M12x1.25 with a 60° taper seat and a 17mm hex.
How many wheel bolts does a Alfa Romeo 166 need?
5 per wheel, so 20 for a full set of four wheels.