The standard lug nut setup for a 2008 Chevrolet Impala is a 5-lug, 115 mm bolt pattern with M14x1.5 threaded lug nuts, using a 60-degree conical seat, and typically a 19 mm (3/4 inch) hex/socket. This is the common configuration for most stock wheels, though aftermarket wheels can differ. Always verify with your specific wheels or owner’s manual if you have non-standard hardware.
Bolt pattern and nut geometry
Key dimensions you’ll encounter when replacing lug nuts or wheels on a 2008 Impala are summarized below.
- Bolt pattern: 5-lug on 115 mm circle (often written as 5x115).
- Thread size: M14 x 1.5 (metric) for the lug studs and lug nuts.
- Seat style: 60-degree conical (cone) seat, which helps center the wheel and distribute load.
- Common hex size: 19 mm (3/4 inch) for stock GM lug nuts, though some aftermarket wheels may use a different size.
In practice, most 2008 Impalas use these specs, but always verify with your wheel manufacturer or the vehicle’s documentation if you have aftermarket wheels or trims with different hardware.
Variations you might encounter
Some wheels and trims may alter lug nut hardware. Here are common scenarios you might run into.
- Stock wheels: Typically use the 5x115 bolt pattern with M14x1.5 nuts and a 60-degree conical seat.
- Aftermarket or OEM wheels: Some may require a different seat type or thread size; verify the wheel’s specifications before buying replacements.
- Hub-centric rings or center caps: Some setups may need lug nuts that accommodate hub-centric hardware or rings.
If you’re replacing nuts, make sure you use parts approved for your wheels and follow the manufacturer’s torque recommendations to avoid damage or safety issues.
How to verify the exact size on your vehicle
Use these steps to confirm your specific lug nut size for your Impala:
- Check the owner’s manual or the door jamb placard for wheel and lug nut specifications.
- Inspect the lug nuts currently on the vehicle or the wheel package insert for the exact size and seat type.
- If in doubt, bring a known-good lug nut to an auto parts store or measure the thread diameter and pitch with a caliper or thread gauge.
Always ensure you have the correct lug nuts for your wheels and torque them to the manufacturer’s specifications to ensure safety and proper seating.
Summary
For a typical 2008 Chevy Impala, expect a 5-lug, 115 mm bolt pattern with M14x1.5 thread and a 60-degree conical seat. The common lug nut hex size is 19 mm, though aftermarket wheels may differ. If you have non-stock wheels, always verify with the wheel manufacturer or your owner’s manual to confirm the exact hardware requirements.