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  1. #1
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    Default Prop shaft coupling

    Have just adjusted the position of my prop shaft in the coupling, does anyone know to what torque I should tighten the Nylock nuts.

  2. #2
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    Nov 2001
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    scotland
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    Default Re: Prop shaft coupling


  3. #3
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    Default Re: Prop shaft coupling

    Quote Originally Posted by scottie View Post
    Thanks, my old torque wrench is in ft lbs, I think a rough conversion NMEA to ft lbs is divide Nm by 1.3.

  4. #4
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    Jun 2017
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    809

    Default Re: Prop shaft coupling

    Quote Originally Posted by scottie View Post
    That chart is headed "all metal" nuts, nylon might be different.

  5. #5
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    Me: Johannesburg South Africa Yacht: Richards Bay East Coast Africa
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    Default Re: Prop shaft coupling

    Quote Originally Posted by penberth3 View Post
    That chart is headed "all metal" nuts, nylon might be different.
    Nyloc nuts are metal (steel or stainless steel) with a nylon insert so the tightening torque will be the same.
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  6. #6
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    Default Re: Prop shaft coupling

    Quote Originally Posted by Rogershaw View Post
    Nyloc nuts are metal (steel or stainless steel) with a nylon insert so the tightening torque will be the same.
    Won't it need a bit more torque to overcome the effect of the nyloc part?

  7. #7
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    Jun 2017
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    809

    Default Re: Prop shaft coupling

    Quote Originally Posted by Rogershaw View Post
    Nyloc nuts are metal (steel or stainless steel) with a nylon insert so the tightening torque will be the same.


    Yes, I know nyloc nuts are metal. I think the table referred to was for all-metal nuts, i.e. with a metal locking element. These might have a different torque to nyloc.

  8. #8
    Join Date
    Nov 2001
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    Me: Johannesburg South Africa Yacht: Richards Bay East Coast Africa
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    7,347

    Default Re: Prop shaft coupling

    Marginal. The main thing that affects the tightening torque are the materials (nut and bolt) and any lubrication.

    The additional tightening torque can be measured when tightening the nut onto the thread before the nut starts to clamp up tight.

    I did some design work some years ago on pre tensioned structured and had to calculated the tightening torque to tension the structure to the required tension/compression requirements.
    Last edited by Rogershaw; 19-11-19 at 10:16.
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