The most common lug nut socket size for Subaru vehicles is 19 mm, but it isn’t universal—your model or aftermarket wheels may require 21 mm or 22 mm sockets. Always verify for your specific car.
Common lug nut socket sizes you might encounter
Subaru lug nut sizes can vary by model year and wheel type. The sizes listed below cover the ones you’re most likely to encounter in everyday maintenance.
- 19 mm hex (3/4 inch): By far the most common size on many Subaru models with stock wheels.
- 21 mm hex (approximately 13/16 inch): Some trims or aftermarket wheels may use 21 mm lug nuts.
- 22 mm hex (7/8 inch): Rare, usually seen with specific aftermarket wheel configurations.
Using the wrong size can strip lug nuts or damage studs, so if you’re unsure, check your owner’s manual or bring a known lug nut to a parts store for confirmation.
How to determine the exact size for your Subaru
To ensure you’re using the correct socket for your vehicle, follow these steps. This will help regardless of model year or wheel configuration.
- Check the owner’s manual: The wheel and tire or maintenance section typically lists the lug nut size and torque specification.
- Inspect the lug nut head: Look for a size stamp or measure the across-flats with calipers to identify the hex size.
- Test-fit carefully: If you have access to multiple sockets, try them one at a time to confirm which fits snugly without bottoming out or rounding the nut.
- Consider the wheels: OEM wheels often use 19 mm, while aftermarket wheels can require 21 mm or other sizes.
Once you’ve confirmed the correct size, store the socket with your spare/tools kit and use the manufacturer’s recommended torque when reinstalling the lug nuts.
Summary
In practice, Subaru lug nuts are most commonly serviced with a 19 mm socket, but some models and aftermarket setups may require 21 mm or even 22 mm. Always verify the exact size for your specific vehicle by checking the manual, inspecting the lug nuts, or consulting a dealer or parts professional. This helps prevent damage and ensures safe, proper wheel installation.