Socket Size for Semi Truck and Trailer Lug Nuts?

If I got a 40-inch (3.33-foot) breaker bar, would I have difficulties breaking loose a lug nut? I weigh about 155-160 pounds.

 

Not only difficult, some you will never get all will be somewhat difficult. I weigh in at 190 and have jumped up and down on a 6 ft cheater on the end of a 4 ft ratchet and not gotten a few.
I have used a 4 to one multiplier and just succeeded in twisting off 3/4 inch extensions. lol
That little tool I posted will easily take them off when a good 1 in impact will not ,or at least struggle with.

I want to say it is geared 60 to one or somehing.like that.

 

So the higher the gear ratio, the stronger the torque multiplier?

Also, can a torque multiplier be used as a torque wrench!?

 

As long as you’re at Harbor freight, go ahead and get the 1 inch impact gun for big truck tires.

I’ve had mine for over 10 years and it still works fine

 

A torque multiplier can, I have one especially for use with a torque wrench, but it is hi dollar and has it's own gauge on it. I have used a 4 to 1 with a torque wrench, because mine just goes to 600 pounds and I have some bolts that go up to 1450, and it works. The one I posted could not be used with one.
Personally I do use one with tires, especially hib piloted, I tighten them tighter than the specs calls for.

 

I was looking into the physics of levers, and if I’m understanding it correctly, a lug nut torqued to 500 foot pounds means that 500 pounds over a one-foot breaker bar will loosen it. Consequently these would also work:

• 250 pounds on a 2-foot breaker bar
• 167 pounds on a 3-foot breaker bar
• 125 pounds on a 4-foot breaker bar
• 100 pounds on a 5-foot breaker bar

Now that I’m thinking about it even more, one could in theory create a torque wrench provided you have an object weighing exactly 100 pounds and a 5-foot breaker bar to apply 500 foot pounds.

 

Be careful with Harbor.....all those sockets always skip sizes....

Heres a few common sizes your gonna need if you plan on doing your own work.
33 deep for your wheels
1 5/8 for your yoke nuts
2 3/16 for your yoke nuts on your rear ends.
A set of 12 pointblacks metric for your u joint straps
And a set of blacks, from 3/8 up to 1 1/2 metric also
Pull your axles and measure your axle nuts....you'll need a big axle nut socket (usually between 3 1/4 up to 4 1/2)
This will get you going.

 

A lot of the sizes they skip is the same as a standard size.

 

That would be interesting to verify. Every time I use my tools, I use a chart to know which socket or wrench is smaller or bigger without having to wing it. There are some sizes that are almost the same.

• 5/32 inch = 3.97 mm
• 3/4 inch = 19.05 mm
• 1-1/16 inch = 26.99 mm

Something I learned recently is that different brands of tools have slight variances even if they are the same measurement, say, 10 mm. My Stanley are a tighter fit than my Pittsburgh.

 

I do...

Torque wrench, 1" ratchet, adjustable, N·m/lbf·ft; Industrial 4AR

And a one inch impact and an air jack.