4-40 or 6-32 control arms?

[Wayne Galligan]

Well it looks like the standard 6-32 threaded bolt from the ACE Hardware bin is they way to go.  That is what I have been using all along I just haven't heard the pro's and con's on the subject.    I use the flat head bolt and counter sink the hard point.  Using the 1/4"  6-32 threaded aluminum sleeve as a stand off seems to give them a lot of strength and locks the bolt to the control surface.
Although I have seen them used with out this stand off too.   

Wayne G.
  ----- Original Message ----- 
  From: ronlock at comcast.net 
  To: discussion at nsrca.org 
  Sent: Monday, February 14, 2005 11:09 AM
  Subject: Re: 4-40 or 6-32 control arms?


  Ive been using all thread rods from hardware store.
  It's my understanding those are less likely to break than bolts.
  No problems with older 1.20 YS bird or current OS 1.40.

  Ron Lockhart
    -------------- Original message -------------- 

    Which brings up a good point here.

    Do you use steel bolts or stainless steel bolts.
    Stainless is a softer material and would it be prone to breaking easier?
    Or is the harder steel bolt more likely to snap under vibrating conditions?

    Wayne G.


      ----- Original Message ----- 
      From: Rcmaster199 at aol.com 
      To: discussion at nsrca.org 
      Sent: Monday, February 14, 2005 9:09 AM
      Subject: Re: 4-40 or 6-32 control arms?


      In a message dated 2/14/2005 12:22:29 AM Eastern Standard Time, ed_alt at hotmail.com writes:
        I've been using 6-32 bolts to make the control horn arms for my 2M setups so far.  It seems like that might be overkill and that 4-40 would suffice.  Is it OK to go lighter like this?

        Thanks
        Ed A.

      Ed I wouldn't do that especially on ailerons. I have had 4-40's snap off like twigs on 90 sized models before. The vibration kills them.

      Matt
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