Mercedes-Benz SLK wheel bolt & nut sizes
The Mercedes-Benz SLK (1996 on) uses M12x1.5 or M14x1.5 wheel fixings with a R12 radius or R14 radius seat and a 17mm hex, depending on year and wheel type. 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
Sizes by year and wheel type
| Image | Model code | Wheel type | Thread | Length | Seat | Hex size | Finish | Strength |
|---|---|---|---|---|---|---|---|---|
| 1996–2004 5 per wheel | ||||||||
| 170 | Steel Wheels | M12x1.5 | 21mm | R12 radius | 17mm hex | Zinc | Class 10.9 |
| 170 | Alloy Wheels | M12x1.5 | 40mm | R12 radius | 17mm hex | Zinc | Class 10.9 | |
| 2004–2010 5 per wheel | ||||||||
|
| 171 | Steel Wheels | M12x1.5 | 21mm | R12 radius | 17mm hex | Zinc | Class 10.9 |
| 171 | Alloy Wheels | M12x1.5 | 40mm | R12 radius | 17mm hex | Zinc | Class 10.9 | |
| 2011 on 5 per wheel | ||||||||
| 172 | Steel & Alloy Wheels | M14x1.5 | 26mm | R14 radius | 17mm hex | Delta KL100 | Class 10.9 |
| 172 | Alloy Wheels | M14x1.5 | 27mm | R14 radius | 17mm hex | Corrolube + SS | Class 10.9 |
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 Mercedes-Benz SLK
Lost or damaged your locking wheel key? Find a replacement for your Mercedes-Benz.
Common questions
What size are Mercedes-Benz SLK wheel bolts?
Mercedes-Benz SLK wheel fixings are M12x1.5 or M14x1.5 with a R12 radius or R14 radius seat and a 17mm hex, depending on year and wheel type.
Do steel and alloy wheels use the same bolts on a Mercedes-Benz SLK?
No. Steel and alloy wheels use different fixings on the Mercedes-Benz SLK. The table above shows which one fits each wheel type.
How many wheel bolts does a Mercedes-Benz SLK need?
5 per wheel, so 20 for a full set of four wheels.