Socket Size for Semi Truck and Trailer Lug Nuts?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PE_T, Aug 28, 2019.

  1. PE_T

    PE_T Road Train Member

    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.
     
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  3. starmac

    starmac Road Train Member

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    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.
     
  4. PE_T

    PE_T Road Train Member

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

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

    Bakerman Road Train Member

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    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
     
  6. starmac

    starmac Road Train Member

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    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.
     
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  7. PE_T

    PE_T Road Train Member

    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.
     
    Last edited: Aug 28, 2019
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  8. stayinback

    stayinback Road Train Member

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    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.
     
  9. starmac

    starmac Road Train Member

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

    PE_T Road Train Member

    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.
     
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  11. lilillill

    lilillill Sarcasm... it's not just for breakfast

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    I do...

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

    And a one inch impact and an air jack.
     
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