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Thread: Tow ball failure claims another life

  1. #41
    Advanced ablast's Avatar
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    It's funny how much emphasis is put on on rated D shackles. I wonder what the sheer rating on a tow ball is or if there is even a standard?

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  3. #42
    The master farter
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    I dont believe their is one. As they are designed for load stress. Not sheer...

  4. #43
    I am he, fear me the evil twin's Avatar
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    Quote Originally Posted by ablast View Post
    It's funny how much emphasis is put on on rated D shackles. I wonder what the sheer rating on a tow ball is or if there is even a standard?
    Yes there is, specifically A.S. 4177

    Towballs are required to pass sheer testing as follows
    3.1.4.4 Test Procedure for 50mm Coupling Balls
    The test coupling ball shall be attached to the test fixture representing the towbar tongue or lug according to the manufacturers instructions and a longitudinal static force of 66 kN applied through a correctly adjusted coupling body of sufficient capacity.
    NOTE: This testing force in kN is 2.27 t x g x 3 test load factor

    Bottom line is that to meet ADR's a 50mm Towball cannot deform or sheer below 66kN
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  6. #44
    Moderator MudRunnerTD's Avatar
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    I will just leave this here





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