ALUMINUM WHEEL LUG NUT TORQUE SPEC.

[MyPrevost]

What is the torque value required for Aluminum Wheel lug nuts?

Is it the same value for steer, drive, and tag?

The X12 wrench is suggesting 450 ft-lbs. I don’t know if that is right for a Prevost?

Thanks,

JIM

[MyPrevost]

JC
Alcoa recommends 450-500 ft. lbs. for aluminum wheels. Or 350-400 ft lbs. lubricated with SAE 30W oil. I do not recommend using oil.

[MyPrevost]

I read that all wheel lug nuts should be dry, with no oil or lubricant used.

I’m unsure of the torque specification for our steel inner drive axle wheels, so it might be worth checking that as well.

[MyPrevost]

For both steel and aluminum wheels, the torque specification is between 450-500 ft-lbs.

Using the X-12, you should set the torque wrench to 45 ft-lbs (45 x 12 = 540, minus 10% for X-12 driveline drag), which brings the actual torque on the lug nuts within the recommended range.

[MyPrevost]

What is X-12 some sort of multiplier for attaining correct torque?

[MyPrevost]

The X-12 is a 12-to-1 torque multiplier. It’s heavy and costly, but if you need to change your own tires and lack a 1″ impact wrench or air tools, it will get the job done effectively.

It’s ideal for applying the correct torque to wheels after they’ve been lightly snugged with an impact wrench. Alternatively, you can use torque sticks with an impact wrench.

Watching a tire technician tighten lug nuts with an impact wrench without regard to proper torque specs can be quite concerning.

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