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The 2013 Toyota Sienna comes equipped with lug nuts that have an M12 X1.50 thread size. Typically, these lug nuts are either 13/16 inches or 21mm in size when directly from the manufacturer. However, aftermarket lug nuts may sometimes require a different size tire iron. Upon conducting a quick search, lug nuts compatible with the '13 Sienna are found to have heads ranging from 19mm to 22mm. Therefore, if you or a previous owner has replaced them before, the size may vary slightly. The bolt pattern for the 2013 Sienna is 5x114.3 with a center bore of 60.1mm. The "5" indicates that each wheel on the Sienna requires 5 lug nuts as fasteners. For your reference, the torque specification per lug nut is 103Nm, which is approximately 76 lb-ft if you prefer that measurement unit.
If you're planning to maintain your 2013 Toyota Sienna, make sure you have the right lug nut size, which is m12 x 1.50 with a hex size of 20 mm and a length of 1.161 inches.