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The M27-2.0 thread size axle nuts on your 2012 Chevy Impala must be handled carefully when adding or removing lug nuts on your car. Over-tightening can result in snapping or stripping, especially with old or rusted nuts. Stripped nuts will just spin in the socket, making them difficult to remove. In case this happens, a mechanical press may be required to push them out, risking damage to the wheel. Snapped bolts will need the rotor to be removed and unthreaded from the back. To avoid these issues, it's important to exercise caution.
The 2012 Chevy Impala's axle nuts have a threading size of M27-2.0.