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Thread: Using self locking nuts on drilled shank bolts

  1. #1

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    Using self locking nuts on drilled shank bolts

    Is it acceptable? I understand it may be sloppy but...

  2. #2
    8GCBC's Avatar
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    Any heat involved?

    In tension or shear?
    Last edited by 8GCBC; 09-12-2020 at 05:51 PM.
    2018 R44
    IA/A&P, ATP, SES, CFII, MEI, Rotor PPL (2500 TT)
    http://www.youtube.com/watch?v=SXI48e1heuo

  3. #3
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by sdischer View Post
    Is it acceptable? I understand it may be sloppy but...
    Doesn’t bother me as long as not a rotating joint.

    But much more expensive bolt than undrilled bolt.

    I stock both in good quantities finally.


    Sent from my iPhone using SuperCub.Org mobile app

  4. #4

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    Quote Originally Posted by 8GCBC View Post
    Any heat involved?
    No
    In tension or shear?
    Shear.

    I just ordered the wrong boltS and I don’t want to wait three more days for them to come in LOL

  5. #5

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    Thank you everyone for your opinions.

  6. #6
    Charlie Longley's Avatar
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    No issue at all using self locking nuts on a drilled bolt.
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    Gordon Misch's Avatar
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    Quote Originally Posted by Charlie Longley View Post
    No issue at all using self locking nuts on a drilled bolt.
    So long as the drilled hole is not in the grip portion of the nut. 43.13 as something on this, that is more exactly stated.
    Gordon

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  8. #8
    Charlie Longley's Avatar
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    Quote Originally Posted by Gordon Misch View Post
    So long as the drilled hole is not in the grip portion of the nut. 43.13 as something on this, that is more exactly stated.
    Can you point to the exact section of AC43.13 that states this Gordon?

  9. #9
    Gordon Misch's Avatar
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    Quote Originally Posted by Charlie Longley View Post
    Can you point to the exact section of AC43.13 that states this Gordon?
    Well, I may have egg on my face. I can't seem to find a pertinent reference. I know I've read that stipulation somewhere - maybe not 43.13. Seems section 7-34 and following sections would apply. Anybody able to help clarify this?
    Gordon

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  10. #10
    Charlie Longley's Avatar
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    Quote Originally Posted by Gordon Misch View Post
    Well, I may have egg on my face. I can't seem to find a pertinent reference. I know I've read that stipulation somewhere - maybe not 43.13. Seems section 7-34 and following sections would apply. Anybody able to help clarify this?
    Yeah I can clarify it. It’s standard practice to use a bolt with a drilled shank and a self locking nut if a bolt without a drilled shank isn’t available. As Mike pointed out it’s slightly more expensive. But it moves things along.

    Charlie
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    Last edited by Charlie Longley; 09-16-2020 at 12:02 AM. Reason: Typo

  11. #11
    Gordon Misch's Avatar
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    Quote Originally Posted by Charlie Longley View Post
    Yeah I can clarify it. It’s standard practice to use a bolt with a drilled shank and a self locking nut if a bolt without a drilled shank isn’t available. As Mike pointed out it’s slightly more expensive. But it moves things along.

    Charlie
    A&P/IA
    Agree. How can it possibly be wrong? But it still bugs me to find an official reference. Arlington and Toledo aren't that terribly distant - we should touch base one of these days.
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  12. #12
    skywagon8a's Avatar
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    Quote Originally Posted by Gordon Misch View Post
    Well, I may have egg on my face. I can't seem to find a pertinent reference. I know I've read that stipulation somewhere - maybe not 43.13. Seems section 7-34 and following sections would apply. Anybody able to help clarify this?
    "Here is another reminder about self-locking fiber nuts (reminders are sort of rules, too). Do not make a habit of using a self-locking fiber insert type of nut on a drilled bolt smaller than 5/16" in diameter. If you do use a drilled bolt, be sure that there are no burrs around the cotter pin hole that could tear into the elastic insert. Maybe they make too much of this rule but then again, who wants to drive around with slashed tires even if they do hold air?"

    http://dad.walterfamily.org/rv/TonyBingelis/Are%20You%20Using%20Aircraft%20Hardware%20Correctl y_.html
    N1PA

  13. #13
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    Quote Originally Posted by skywagon8a View Post
    If you do use a drilled bolt, be sure that there are no burrs around the cotter pin hole that could tear into the elastic insert.

    Thats the only part i remember about their usage.
    I may be wrong but that probably won't stop me from arguing about it.

  14. #14
    Charlie Longley's Avatar
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    Quote Originally Posted by Gordon Misch View Post
    Agree. How can it possibly be wrong? But it still bugs me to find an official reference. Arlington and Toledo aren't that terribly distant - we should touch base one of these days.
    I think we were both at the aviation trade show in Puyallup a few years ago. I ran into Eric there but didn’t see you. Stop by my hangar in Arlington sometime and check out my project. I am right next to the Castle & Cooke gas pump.
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    So it's okay to use castle nuts on bolts with burrs???
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  16. #16
    Steve Pierce's Avatar
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    Piper did it when they moved from castle nuts to self locking nuts. After seeing some bolts in tension fail at the cotter pin hole I make sure I don't do it.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
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  17. #17
    skywagon8a's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Piper did it when they moved from castle nuts to self locking nuts. After seeing some bolts in tension fail at the cotter pin hole I make sure I don't do it.
    I too have seen that, but generally consider the bolt was too short for the application. As long as the cotter pin hole is outside of the threads of the nut even though inside the elastic stop, the bolt should not break.
    N1PA
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  18. #18
    Steve Pierce's Avatar
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    I don't remember the application, many years ago on a warbird. I have a good collection of hardware so try and use the corresponding bolt to match the nut.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
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  19. #19
    Charlie Longley's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    I don't remember the application, many years ago on a warbird. I have a good collection of hardware so try and use the corresponding bolt to match the nut.
    Yeah I have a pretty good collection of hardware too. When I run across it I’ll try and change the hardware cause it hurts my eyes.
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  20. #20
    Steve Pierce's Avatar
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    Today while torquing one of the three 1/4" drilled bolts between the two crankcase halves at the oil sump that get safety wired together.
    Click image for larger version. 

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    Last edited by Steve Pierce; 09-23-2020 at 06:14 PM.
    Steve Pierce

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  21. #21
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Today while torquing one of the three 1/4" drilled bolts between the two crankcase halves at the oil sump that get safety wired together.
    Click image for larger version. 

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    Click image for larger version. 

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    does not look like a nylock to me.......

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