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NAS BOLTS: Use with AN Nuts

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Mon Aug 03, 2009 9:42 am Post subject: NAS BOLTS: Use with AN Nuts

Here is a technical question for you:  Can NAS bolts be used with AN nyloc nuts.  



One bolt hole on my spar plate connection was reamed slightly to large by about 1/64".  I don't really wish to go up to the next size AN bolt even though it is allowable per Zenith.  My plan is to use a close tolerance oversize NAS bolt in lieu of the AN bolt.   I have researched and found that the NAS bolt is actually stronger than AN bolts, however due to the critical nature of this connection, I want to make sure that I don't overlook any details.  



BTW in the case that anyone else finds themselves in the same situations oversize bolts are extremely expensive, and are extremely hard to find.  



Try 50-70 dollars a piece for an AN 6-11.  Yes that is EACH bolt 50-70 dollars.

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Mon Aug 03, 2009 9:49 am Post subject: Re: NAS BOLTS: Use with AN Nuts

Let me correct my post above... They do not make oversize AN bolts, however they do make oversize NAS bolts albeit all but impossible to find.  i.e. 



NAS6606-11X 

660 is the series and means that it is a close fit, 6 means it is a 3/8 bolt, 11 means it is 11/16 and the X is the IMPORTANT part meaning it is 1/64" oversize.  There is also a Y designation which means it is 1/32" oversize.



Take your time while reaming.  I'll still be discussing this further with Zenith to make sure that everything is A-OK but any input regarding the compatibliity between NAS and AN bolts and nuts is appreciated.



Thanks

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psm(at)att.net
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Posted: Mon Aug 03, 2009 12:52 pm Post subject: NAS BOLTS: Use with AN Nuts

I got some AN-6 Bolts from Aircraft Spruce for a lot less than 

that.  I don't remember the exact price, but it was probably around $1.00



Paul

XL waiting for engineering changes



At 10:42 AM 8/3/2009, you wrote:

 	  Quote: 	
		  BTW in the case that anyone else finds themselves in the same 

situations oversize bolts are extremely expensive, and are extremely 

hard to find.

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Mon Aug 03, 2009 1:17 pm Post subject: Re: NAS BOLTS: Use with AN Nuts

First I should specify this is for a 601 HD.



Second, an AN 6 fastener is anywhere from .0363-.375 in.  or + 0.000/-.012....  Problem here is my plate, actual reamed hole dimension, which I intended to ream to .375in is actually slightly ovaled with the greatest dimension measuring approximately .389 inches.



So, to ensure a tight fit the only other option I can come up with is use a 1/64" oversize bolt, or use an AN7.  An AN7, though acceptable is at the very very limits of allowable, since the edge distance now becomes critical...



Yes, a standard AN6 bolt should be a dollar or less, and AN7 should be a dollar or less.  an NAS6606-11 should be about 3 or so dollars and BUT an NAS6606-11"X" goes for about fifty bucks.

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