Fiat 500 wheel bolt & nut sizes
The Fiat 500 (2007 on) uses M12x1.25 wheel fixings with a 60° taper seat and a 17mm hex. It has 4 per wheel, so a full set is 16. 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 |
|---|---|---|---|---|---|---|---|---|
| 2007 on 4 per wheel | ||||||||
| 500 312 | Steel & Alloy Wheels | M12x1.25 | 22mm | 60° taper | 17mm hex | Delta KL100 | Class 8.8 |
|
| 500C 312 | Steel & Alloy Wheels | M12x1.25 | 22mm | 60° taper | 17mm hex | Delta KL100 | Class 8.8 |
| 2012 on 4 per wheel | ||||||||
|
| 500L 199 | Steel & Alloy Wheels | M12x1.25 | 22mm | 60° taper | 17mm hex | Delta KL100 | Class 8.8 |
| 2015 on 4 per wheel | ||||||||
|
| 500X 334 | 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 Fiat 500
Lost or damaged your locking wheel key? Find a replacement for your Fiat.
Common questions
What size are Fiat 500 wheel bolts?
Fiat 500 wheel fixings are M12x1.25 with a 60° taper seat and a 17mm hex.
How many wheel bolts does a Fiat 500 need?
4 per wheel, so 16 for a full set of four wheels.