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The 2018 Ram 3500 is equipped with M14 X1.5 thread lug nuts that have a 22mm hex head. However, these can be easily swapped for different ones if needed. If you're uncertain about the current lug nuts on your Ram 3500, especially if you bought it used, it's advisable to check the size for yourself in a controlled setting like your driveway or garage. There are eight lug nuts on each wheel, indicated by the 8x165.1 bolt pattern. Depending on your vehicle's setup, you'll need between 160 and 200 Nm of torque to properly secure each lug nut. Consider replacing all the lug nuts at once to ensure they are a perfect match; many aftermarket lug nuts offer competitive pricing in bulk quantities, which may be another factor to think about.
The official specifications for the 2018 Ram 3500 state that the lug nut size is M14 x 1.50 in terms of thread size, with a hex size of 13/16".