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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
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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
    Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.

  5. The Following 4 Users Say Thank You to the evil twin For This Useful Post:

    Bigcol (28th November 2015), mudski (28th November 2015), Playmoney08 (4th January 2016), rusty00 (1st December 2015)

  6. #44
    Moderator MudRunnerTD's Avatar
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    I will just leave this here





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