What tool to tighten?

Discussion in 'General Electronics Chat' started by ErnieM, May 30, 2014.

  1. ErnieM

    Thread Starter AAC Fanatic!

    Apr 24, 2011
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    What kind of tool fits these knurled nuts used on switches?

    My fingers just don't get them tight. I've resorted to putting the knurled backside and the hex nut on front. At least I can get a wrench on the hex.

    [​IMG]
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
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    Slip-joint pliers with serrated teeth that match the knurl pitch.

    Use caution, don't mangle the nut or scratch the faceplate!

    A lockwasher on the rear side, along with a drop of removable Locktite on the threads helps prevent it from coming loose long term, then you don't need to use as much force on the nut.
     
  3. KMoffett

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    Dec 19, 2007
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    Surgical hemostats (surgical clamps) are perfect for those nuts. Nice fine serrated jaws. Electronic and industrial supply vendors carry them.

    Ken
     
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  4. mcgyvr

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    Oct 15, 2009
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    "girlie" fingers just don't cut it. :)

    Lets see... whats the name of the tool for a fastener designed to be "tool-less" ??
     
  5. tracecom

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    Apr 16, 2010
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    I always thought that one should put the hex nut on first, insert the shaft through the panel, put the serrated nut on to the depth required by the panel thickness, and then tighten the hex nut against the rear of the panel. (Avoids scarring the front of the panel.)
     
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  6. sirch2

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    Jan 21, 2013
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    I'd agree with tracecom, set the depth correctly with the knurled nut and then tighten at the back with the hex nut, can be awkward though, a right angle spanner can be handy
     
  7. gerty

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    Aug 30, 2007
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    + 1 Tracecom, that's the procedure I was taught a hundred years ago....

    Edit: A right angle spanner can be a crows foot wrench..
     
  8. atferrari

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    Can anyone show a picture of that thing assembled as "it should"?
     
  9. inwo

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    Nov 7, 2013
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    A wrench from a moped, bicycle, or bi-fold door is thin enough to make a good tool for this.

    Not difficult to make one from scratch with a hacksaw and file.
     
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  10. THE_RB

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    Feb 11, 2008
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    I use large pliers with curved concave areas on the jaws that are serrated.

    Good grip, good matching radius, no damage to the round nut.
     
  11. Markd77

    Senior Member

    Sep 7, 2009
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    You can normally tighten them quite well if you use a sharp, pointy thing and push it round.
     
  12. GopherT

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    Nov 23, 2012
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    I just used these. Work fine but I used a big pair so they are not opened to their extreme when pinching the bolts. The serrations curve at the tip to align with those of the knurled nut.

    [​IMG]
     
  13. KJ6EAD

    Senior Member

    Apr 30, 2011
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    Last edited: May 31, 2014
    absf, ErnieM, #12 and 1 other person like this.
  14. tracecom

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    Apr 16, 2010
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  15. MrChips

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    Oct 2, 2009
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    New to me too. Good to know.
     
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  16. tracecom

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    Apr 16, 2010
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    Since there is a tool for tightening those nuts, there should be a standard for defining the number of knurls? per inch/cm. I googled around looking for such, but didn't find it. I did find the attached document and was amused by the switch picture on page 5.
     
  17. atferrari

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    Quite an old model.
     
  18. inwo

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    3 hours later.......................................................................................................................................
    ........


    Oh I see!!!!!!!!!!!
     
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  19. djsfantasi

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    Apr 11, 2010
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    If you don't have any if these specialized tools, I use a pair of narrow needlenose pliers.

    I'll put a small piece of masking tape on a piece of glass. Then, trace the knurled nut on the tape. With a razor knife, cut out the inside of the circle.

    After inserting the switch and lightly screwing on the nut, I place the masking tape over the nut. Then, using the needlenose pliers doesn't scratch the face plate. Repeat as necessary.
     
  20. Metalmann

    Active Member

    Dec 8, 2012
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    Same here.
     
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