- Replacement for a lost axle nut or upgrade for bikes equipped with a castle-style axle nut
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1985-1992 | Kawasaki | KX125 | |
| 1985-1992 | Kawasaki | KX250 | |
| 1985-2004 | Kawasaki | KX500 | |
| 2001-2009 | Yamaha | WR250F | |
| 2011-2013 | Yamaha | WR250F | |
| 2015-2024 | Yamaha | WR250F | |
| 1998-2000 | Yamaha | WR400F | |
| 2001-2002 | Yamaha | WR426F | |
| 2003-2009 | Yamaha | WR450F | |
| 2011-2023 | Yamaha | WR450F | |
| 2000-2024 | Yamaha | YZ125 | |
| 2000-2024 | Yamaha | YZ250 | |
| 2001-2008 | Yamaha | YZ250F | |
| 2015-2024 | Yamaha | YZ250FX | |
| 1998-1999 | Yamaha | YZ400F | |
| 2000-2002 | Yamaha | YZ426F | |
| 2003-2008 | Yamaha | YZ450F | |
| 2016-2023 | Yamaha | YZ450FX | |