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Thread: 50mm tow balls

  1. #16
    Member Mathias's Avatar
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    Quote Originally Posted by cambo View Post
    50mm ball is very common
    Higher rating for a start.
    1 7/8" & 50mm have the same rating. Its not the ball diameter that determines the rating, its the threaded shank size that does that. 3/4" shank is usually 2000kg and the 3500kg is 7/8" or 1" shank. The 7/8" is usually a heat treated steel to increase tensile strength to handle the load.

  2. #17
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  3. #18
    The Original Striker
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    a long time ago, dad helped the neighbor move to the west coast from te awamutu.
    had a 1 7/8 ball on the ute and had to change to a 50mm,
    they got busy halfwalf thru the change and wasnt untill they got there 900km later they realised they hadn't put the nut on it(found nut in tool box), the freezer on the front with 500kg of meat in it kept it down
    Bigger Better Faster Stronger
    Handle the Jandle, or get off the Beach

    The Original Striker

  4. #19
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    A correctly loaded trailer means no cockups... Amazing how many fail on this little fact.
    striker, veitnamcam and Gapped axe like this.

  5. #20
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    I was not impressed when the 50mm ball was brought out as the new standard.
    It's to damned close to 1 7/8.
    I've seen a number of f**k ups from people putting a 50mm coupling on a 17/8 ball.
    Once worn they can easily separate with pretty shit results.
    Back a week or two the Heavy Duty combination was 2 1/4".
    It was pretty obvious the difference.
    All my stuff is 17/8 with 1" shafts (3500kg) rated.
    I do carry a spare 50mm for towing other's gear.
    If you are regularly towing max legal loads a pintle coupling takes a lot of beating. Stops op from asking to borrow too.
    veitnamcam and berg243 like this.

  6. #21
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    Didn't think the pintle was WOF-able now? Thought that it had been pulled as an option for everything other than COF-vehicles - the light '5th wheel' turntables get around it by being a towball coupling but inverted, ball on trailer...

    Going back to the other comment I made, if you've loaded your trailer correctly with 10% GVM as coupling down force (for a 3500Kg trailer that's 350Kg on the ball) the coupling tongue won't be taking much load or metal-metal wear preventing a lot of the separation issues.

  7. #22
    Member Beetroot's Avatar
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    Quote Originally Posted by Frogfeatures View Post
    Iíve got an 1 7/8 on the car, and a 50mm in the vehicle toolbox
    Got caught once with a hire trailer, bloody annoying.
    This is what happened to me.
    Long story short I hired a ute specifically to tow a trailer whilst away from home, went to hook up the hire trailer and it didn't fit.
    The guy hiring the trailer (who was doing all this via phone) said that car hiring places in Queenstown put 50mm tow ball on all their vehicles despite every hire company he knows of using 1" 7/8 trailer hitches.

    According to the hire company it's not their responsibility to know what size tow ball I'd require, despite them choosing to fit the "wrong" sized tow balls.
    Every trailer I have towed be it big or small has always been 1" 7/8, seems like a complete balls up to have two different sizes both legally certified but no obvious way to differentiate the two apart and no plan from the powers at be to standardized on one of them.

  8. #23
    Almost literate. veitnamcam's Avatar
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    1 inch and 7/8 everything.
    Beetroot, berg243 and Finnwolf like this.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  9. #24
    Member gadgetman's Avatar
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    Quote Originally Posted by Mauser308 View Post
    Had one of those on the Safari. Great for towing the 3.5T covered transporter.

    I tend to fit 1-7/8 balls on my vehicles and duofit couplings.
    There are only three types of people in this world. Those that can count, and those that can't!

  10. #25
    Member Gapped axe's Avatar
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    Pays to check before hooking up, the consequences can be devastating not alone exspensive.
    "ars longa, vita brevis"

  11. #26
    MB
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    My boat trailer came with 50mm. Had 1 7/8" on the car at the time. Boat dealer said "she"ll be right" and it was, but it so easily couldn't have been. Brand new pride and joy could have ended up in the ditch or worse! 1.5 hour drive on Northland roads too. Anyway, have an interchange ball now. Agree though, 50mm is a pain in the arse, or at least having two sizes of ball. An example of where health and safety has actually made things more dangerous?
    XR500 likes this.

  12. #27
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    Boat dealer said "she ll be right"

    https://www.google.co.nz/search?q=go...bVYnAV_ORaVRPM

 

 

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