What size nut is on a CV axle?
There is no single universal nut size for CV axles—the size depends on the vehicle. In practice, you’ll commonly encounter nuts in the 30–36 mm range, with the exact size determined by the car’s make, model, and hub design. Always verify the size in the vehicle’s service manual or by measuring the nut with the correct socket.
Why the size varies
The outer CV joint is secured to the wheel hub by a large nut, and hub assemblies differ across manufacturers. The nut must fit precisely to clamp the joint without risking stripped threads or insufficient clamping force. That design diversity means there isn’t a universal value, only a range that covers most passenger cars and light trucks.
Typical size ranges you might see
Common CV axle nut sizes span several millimeters. The following values are widely encountered across many makes and models, though exact sizing for your vehicle should be confirmed from documentation or measurement.
- 30 mm — a frequent size on many front‑wheel‑drive and compact vehicles
- 32 mm — common on a broad range of models from different brands
- 34 mm — used on some larger cars and mid‑sized SUVs
- 36 mm — found on certain vans, trucks, and higher‑load applications
- Other sizes — rare cases exist outside this range; always verify for your specific model
Because the exact size depends on the vehicle, don’t assume—check the manual or measure the nut with the correct socket before removing or replacing it.
How to identify the correct size for your vehicle
Use these steps to confirm the correct nut size for your CV axle. Following these steps helps prevent damage to the axle, nut, or hub threads and ensures proper installation.
- Consult the vehicle’s service manual or manufacturer specifications for the recommended axle nut size and torque.
- Inspect the existing nut or hub markings; some nuts or packaging show the size directly on flats or labels.
- Measure across the nut flats with a caliper or use a set of metric sockets to find the snug fit (start with commonly used sizes like 30–36 mm).
- Verify whether a specific nut style is required (e.g., 12‑point vs 6‑point) or if a locking mechanism (cotter pin/lock washer) is used.
- Apply the correct torque with a calibrated torque wrench and replace any locking hardware as specified by the manual.
Having the correct size and torque ensures the CV joint remains securely fastened and reduces the risk of axle/hub failure during operation.
Torque and security considerations
Some CV axle nuts require locking devices or cotter pins, and the torque specification can vary by vehicle. Always follow the official service instructions, and replace any locking hardware as required to maintain proper protection against loosening.
Summary
There isn’t a universal CV axle nut size. Expect to encounter sizes in a typical range of 30–36 mm, with exact sizing depending on the vehicle. Always confirm with the owner’s or service manual, or by measuring the nut, and follow the specified torque and locking requirements during installation.
