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nomad297's avatar
nomad297
Explorer
Dec 23, 2014

For the Mathematicians:

I have a torque wrench that will only measure as high as 150 ft-lb. I need to torque a couple bolts to 300 ft-lb. I don't want to buy another torque wrench that will measure that high because I don't see much use for it (for me) other than for these two bolts.

I have a 24" breaker bar which will be strong enough to achieve 300 ft-lb, but I need somebody more mathematically inclined than myself to help me figure out the solution.

How many pounds of downward/rotational force will be needed at the 24" point on my breaker bar to achieve approximately 300 ft-lb of torque on these bolts?

Thank you,

Bruce

67 Replies

  • wing_zealot wrote:
    So the only question that remains is - how you going to measure the 150# of force at the 24" point?


    He needs 300...with the wrench set to 150 with an extension, it will click, but it will be 300, not 150....

    Cale
  • So the only question that remains is - how you going to measure the 150# of force at the 24" point?
  • nomad297 wrote:
    atreis wrote:
    Beats me - I took mine to my mechanic and had him do it. He's got the proper tools for it.


    I, too, have the proper tools -- I just need the mathematical advice to use them properly.

    Bruce


    You are right...just a little math. What some folks don't understand....the torque wrench is calibrated for the length of the handle....holding it much closer to the rachet head is different from holding it at the end of the handle....remember, you want to be 24in from the rachet head. Not another 24in from the end...

    Try this web site: Torque extension

    Cale
  • atreis wrote:
    Beats me - I took mine to my mechanic and had him do it. He's got the proper tools for it.


    I, too, have the proper tools -- I just need the mathematical advice to use them properly.

    Bruce
  • Beats me - I took mine to my mechanic and had him do it. He's got the proper tools for it.
  • kaydeejay wrote:
    150# of force at 24" is 300 #/ft.
    Not sure where the torque wrench fits in this scenario.


    That's the answer that I assumed, but it seemed too easy of a solution, so I asked here. Thank you for the answer.

    The torque wrench fits in because I have one and I don't want to have to buy another to measure 300 ft-lb one time. I have no use for that heavy of a torque wrench, especially with the solution you provided being so simple.

    Thanks again,

    Bruce
  • 150# of force at 24" is 300 #/ft.
    Not sure where the torque wrench fits in this scenario.