The front axle nut on a 2009 Honda Civic is 30 mm across flats. There is no standard rear axle nut on the stock front‑wheel‑drive Civic.
Front axle nut size on the 2009 Civic
The 2009 Civic, part of the ninth generation, uses a front axle nut to secure the CV axle to the wheel hub. The widely used size for this nut is 30 mm across flats, and it is typically a 12‑point design. This sizing covers most trim levels and markets for Civics manufactured between 2006 and 2011, though there can be minor variations. Always confirm with the official service manual or a VIN‑specific parts diagram if you’re unsure.
Key specifications for the front axle nut:
- Across flats: 30 mm
- Nut type: 12-point design
- Location: Outer end of the CV axle at the front wheel hub
- Applicability: Common to 2006–2011 Civics in standard FWD configurations
In practice, when removing or reinstalling this nut, use the correct 30 mm socket, ensure the axle and hub surfaces are clean, and follow the manufacturer’s torque and re‑lock instructions if your model uses a locking device.
Important considerations for the 2009 Civic
The 2009 Civic in stock configuration is front‑wheel drive, which means there is effectively only one axle nut to contend with—the front axle nut. If you encounter a nonstandard setup (such as aftermarket AWD conversions), sizes may differ, so consult the service manual or VIN‑specific documentation before proceeding.
Summary
For a 2009 Honda Civic, the standard axle nut you’ll encounter is 30 mm across flats on the front axle. There is no rear axle nut in the stock FWD configuration. Always verify against the official manual or parts diagrams for your exact vehicle to account for market or trim variations.