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AN-3 + Drill Bit Question

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Michael Valentine

Joined: 09 Jan 2006
Posts: 108

Posted: Sat May 05, 2007 9:10 am Post subject: AN-3 + Drill Bit Question

Are #12 and 3/16 drill bits equivalent?  I had been using 3/16 for all my bolt holes and nut plates, but a while back on the rear fuse the guide (I think) mentioned a #12 - I think it was an AN-3 bolt.  Anyway, I thought it would be easiest to just ask before it comes up for me again!  If the plans call for an AN-3, which drill bit do you pull out? 



Thanks, Michael in NH

  [quote][b]

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craig(at)craigandjean.com
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Posted: Sat May 05, 2007 9:19 am Post subject: AN-3 + Drill Bit Question

http://www.patchn.com/drillsizesnumbered.htm

 http://www.thedirtforum.com/conversions.htm

  

 3/16 = 0.1875.

 #12 = 0.1890 or about a 0.8% difference

[quote] -- Craig [b]

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planejim(at)bellsouth.net
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Posted: Sat May 05, 2007 11:42 am Post subject: AN-3 + Drill Bit Question

Michael,

  

 Over the years I've followed the old idea that a  loose fit will only get more loose with use and time. Use the smallest hole  which will allow the bolt to be installed. If the fit is critical you can use a  reamer, but that isn't necessary in most cases. 

  

 I saw a Midget Mustang I that had aileron flutter  because of accumulated slop in the system where # 12 drill was used with AN #3  bolts. We were able to fix it by going to NAS 3 bolts and in one location using  and "oversize" ( special ) bolt.

  

 A lot depends on the installation. I.E. fixed or  moving joint. Snug is GOOD, slop is BAD.

  

 Jim Hoak

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