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The Chevy HHR uses lug nuts with a thread size of M12 x 1.50 and a hex size of 19 mm. A lug nut is a fastener with one end rounded or conical, used for securing wheels to a vehicle's axles. If you switch to aftermarket wheels, it's important to have the right lug nuts that fit correctly, as most original lug nuts may not work with aftermarket wheels. To ensure a good fit, it's recommended to buy a wheel installation kit. Lug nuts should be tightened to the manufacturer's specifications, and they should be retightened to those specifications after driving 50 to 100 miles on your new tires.
The Chevy HHR uses lug nuts with a thread size of M12 x 1.50 and a hex size of 19 mm.