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The wheel lug nuts on a Chevrolet Express might have different hex head sizes depending on the model year and setup. Keep in mind that previous owners might have swapped them out with custom parts, affecting the head diameter and length, but the thread size should stay the same. The original lug nuts will always be M14 X1.50. Most will likely have 22mm hex heads, although some could be around 13/16 inches. The total length can range from 20.5mm to 28.5mm, but this detail isn't critical overall. Your bolt pattern shows that each wheel requires SRX lug nuts, and they should be torqued to 190 Nm. It's crucial to adhere to this torque specification to ensure the driver's safety and others on the road.
Refer to the information provided earlier in this document.
The Chevy Express comes equipped with a lug nut that measures 14 millimeters in size.