Nyloc nuts for trailer suspension components

  1. skotl

    skotl Forum Supporter

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    I'm in the process of knitting a trailer back together - for the sake of this thread, it would be good to stick to the discussion of suspension components without digressing into legal nuances of trailer builds :whistle:

    The question here is around leaf springs connecting to the suspension components. Here's a good picture:

    [​IMG]

    My question is around the nuts that attach to the U-bolts on the leaf springs but also the nuts that are threaded through the bushes.

    Is a nyloc nut enough? Should there be another couple of nuts behind it that are tightened up? Should I be using threadlock? Or some other solution?
     
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  2. Farside

    Farside Badly Welded Man

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    Nylocs have been enough on plenty of commercially made trailers I've seen.
     
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  3. knighty Forum Supporter

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    every car/van/truck suspension part I've ever seen just has a single nylock nut
     
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  4. skotl

    skotl Forum Supporter

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    That will make my life way easier! Thanks.

    Does the plastic in nylocs break down over time?
     
  5. Farside

    Farside Badly Welded Man

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    In adverse conditions, like heat, yes.
    Normally, they seem to grip really well, but I've seen some really old or cheap ones that seem to have got a bit hard and brittle.
    Proper, decent ones will be fine.
    To do a proper job, use once. If you have to re-do any throw them out.
     
  6. knighty Forum Supporter

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    not that I've ever seen... trying to think of the oldest thing I've worked on with them.... must be over 15 years ?
     
  7. skotl

    skotl Forum Supporter

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    That's all very comforting, with special thanks to @Farside

    I'm comfortable, then, to just run ahead with bolts and nyloc nuts
     
  8. Rocketman Member

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    I work with plastics all the time so you would think I would know how long the nylocs might last, but I don't :laughing:

    At the end of the day it's a nylon insert (pa6 or pa66) in the nut. You can look up nylon but there is pretty well zero on it's long term life expectancy. I would be surprised if they didn't last at least 15 years though.
     
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  9. skotl

    skotl Forum Supporter

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    That'll do for me!
    Do you think there is any benefit in adding threadlock to a nylock nut?
     
  10. Rocketman Member

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    England Leicestershire
    I wouldn't bother.
     
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  11. fizzy Forum Supporter

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    Could actually damage the plastic depending on the threadlock so no I wouldn't.
     
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  12. Farside

    Farside Badly Welded Man

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    They've been around a long time. I don't know how long they'd been out when I started using them, but that was >40 years ago. At that time, plenty of cars still used staked and/or castellated nuts with split pins, but they all moved over to nyloc eventually, as they proved themselves reliable (and cheaper, probably). Istr Ford and Chrysler were using them about then, on newer models coming out.
     
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  13. Robotstar5

    Robotstar5 Casanunda Staff Member

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    Aerotite nuts don't even have the plastic to worry about.
     
  14. Spark plug

    Spark plug Member

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    How mutch :o
     
  15. bricol Member

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    767
    N.Yorks, UK
    I had a 1968 Triumph Spitfire with them on - so undoubtedly been around longer than that.

    I would hope the shackles in the picture have a tube between them, so the nut is tightened down against it - the nyloc bit then helps prevent loosening under vibration.
     
  16. 8ob

    8ob Forum Supporter

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    I have never seen a shackle at the front of any spring/ suspension system before. :dontknow:

    Bob
     
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  17. rtbcomp

    rtbcomp Moderator Staff Member

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    They've been around since before nylon was invented. Simmonds nuts had a fibre insert, similar to the stuff fibre washers are made from.
     
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  18. As I understand it Ben Hur's big chariot crash was caused by the incorrect use of used Nyloc nuts!
    :scared:
     
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  19. rtbcomp

    rtbcomp Moderator Staff Member

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    I think the shackles are at the rear - look at the orientation of the diff housing. I suspect the labelling is wrong. FWIW some cars with tourque-tube axles had shackles at each end of the spring.
     
  20. CompoSimmonite Member

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    My UMM Transcat and Mahindra MM540 (both have Dana axles) have the leaf spring shackles at the front.
     
    indy4x likes this.
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