If you own a Subaru, knowing the proper lug nut size and torque specifications is crucial for safe wheel installation. Subaru lug nuts come in a few different sizes depending on the model and year of your vehicle. In this guide, we’ll break down the different Subaru lug nut sizes and provide torque specs so you can securely fasten your wheels.
Quick Summary
- The lug nut size on most Subarus is 12mm x 1.25.
- To remove and install Subaru lug nuts, you’ll need a 19mm socket.
- For most Subaru models, the hex size is 5/16 inch.
- Subaru’s factory torque spec for lug nuts is 79 ft-lbs for steel wheels and 89 ft-lbs for aluminum wheels.
What Size are OEM Subaru Lug Nuts?
The lug nut size on most Subarus is 12mm x 1.25. This includes models like the Impreza, Legacy, Outback, Forester, Crosstrek, and newer WRX/STi models. It’s important to stick with OEM Subaru lug nuts or get high-quality aftermarket nuts in the proper size. Using the wrong size can lead to stripped threads or loose wheels.
Subaru Lug Nuts Size Chart
| Model | Year | Lug Nut Size | Thread Pitch | Center Bore | Torque |
|---|---|---|---|---|---|
| Ascent | 2018-2023 | M12 x 1.25 | 1.25 | 56.1 mm | 120 Nm |
| B9 Tribeca | 2006-2007 | M12 x 1.25 | 1.25 | 56.1 mm | 100 Nm |
| Baja | 2003-2006 | M12 x 1.25 | 1.25 | 56.1 mm | 100 Nm |
| BRZ | 2012-2023 | M12 x 1.25 | 1.25 | 56.1 mm | 120 Nm |
| Crosstrek (Hybrid) | 2013-2023 | M12 x 1.25 | 1.25 | 56.1 mm | 120 Nm |
| Forester | 1999-2023 | M12 x 1.25 | 1.25 | 56.1 mm | 100-120 Nm |
| Impreza (Outback Sport, WRX, WRX STI) | 1993-2023 | M12 x 1.25 | 1.25 | 56.1 mm | 100-120 Nm |
| Legacy (Outback) | 1990-2023 | M12 x 1.25 | 1.25 | 56.1 mm (or variable) | Variable |
What Size Socket are Subaru Lug Nuts?
To remove and install Subaru lug nuts, you’ll need a 19mm socket. This fits the standard 12mm x 1.25 nuts.
So the common socket sizes are:
- 12×1.25mm lug nuts: 19mm socket
Having a quality six-sided impact socket makes removing lug nuts much easier. Avoid using low-quality twelve-point sockets which can round off the nuts.
What Size Hex are Subaru Lug Nuts?
In addition to the socket size, you’ll need a hex key to fit the center cap of Subaru lug nuts.
For most models, the hex size is 5/16 inch. This allows you to hold the nut in place while torquing the wheel down.
Some aftermarket lug nuts may use a slightly different hex size. Make sure you have a hex key that properly fits the lug nut caps.
What Torque Spec are Subaru Lug Nuts?
Applying proper torque to the lug nuts is critical for safety. Under-torqued nuts can lead to loose wheels and over-torqued nuts can damage the threads.
Subaru’s factory torque spec for lug nuts is:
- Steel wheels – 79 ft-lbs
- Aluminum wheels – 89 ft-lbs
It’s important to use an accurate torque wrench and tighten the lug nuts incrementally in a star pattern. This ensures even loading across the wheel.
Retorque the lug nuts after around 100 miles of driving as the wheels can initially settle under load. This ensures lug nuts remain tight.
For aftermarket Subaru lug nuts, the BONOSS brand is a top choice. They offer special processed steel lug nuts in the correct Subaru thread pitch and size. Here’s why BONOSS Subaru lug nuts are ideal for your Subaru.
- Strong steel construction
- Accurate OEM thread pitch prevents stripping
- Special coating resists rust and peeling
- Security
- SGS and TUV certifications for safety
- Hundreds of positive reviews from Subaru owners
BONOSS lug nuts provide exceptional durability and security. And they come in a variety pack with all the tools needed for lug nut replacement. Using the factory size lug nuts at the specified torque is critical for keeping your Subaru wheels firmly attached. With the variety of Subaru lug nut sizes, it helps to identify the specific size your model uses before wheel removal. Investing in quality lug nuts like BONOSS provides confidence your wheels will stay properly fastened for the long haul.
