jay(at)horriblehyde.com
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 Posted: Tue Mar 26, 2013 11:25 am Post subject: Blind riveting ground to airframe? AN Bolts |
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Hello again Sacha,
Yep you are correct; the US is capable of producing remarkable feats of engineering- even more so when you consider the horrible measurement systems that they use!
How about drilling the hole larger, to say a 10mm hole and then bushing it with a 10mm OD and 5/16th (7.94mm) ID mild steel insert?
Jay
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Sacha
Sent: 26 March 2013 05:54 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Blind riveting ground to airframe?
Echo that... It's a shame that our US friends (and hence much of the aviation world) is still stuck using that antiquated system... Metric seems so much more coherent.
Anyway at the moment I'm presented with a situation which requires me to use metric which is why I'm asking the question. I've also been doing what you do (stainless for non structural, AN for the structural parts) but I am now presented with the following dilemma:
For some reason the previous owner has drilled some 8mm holes and appears to have been using 8mm stainless bolts to fasten the wings of the Kitfox I'm rebuilding. The original design calls for 5/16" diameter holes and AN5 bolts. But now I'm reluctant to use them because an AN5 bolt will be a bit loose (5/16" = 7.93mm) in an 8mm hole. On the other hand an M8 regular stainless bolt is not really strong enough.
The best I've found so far is A4-80 a.k.a "strong stainless" which has a shear strength of 800MPa (vs the 700MPa of regular stainless). Plugging in the numbers gives a shear capacity of an M8 bolt as 800*8*8*pi/4= 40kN which is approx 9000 lb. This is still approx 20% below that of an AN5 bolt (11500lb). Hence my search for metric "aircraft grade" fasteners...
Ok sorry for the rant and for straying OT. I thought I would try to use the vast knowledge base if this group since I'm getting nowhere with Google... (just mentioning this in for you Eric...
Sacha
On Mar 26, 2013, at 15:25, "Jay Hyde" <jay(at)horriblehyde.com (jay(at)horriblehyde.com)> wrote:
[quote]
Hello Sacha,
I have the same problem in South Africa. For non structural parts I simply use Metric sized bolts and nuts; usually stainless steel ones to protect against corrosion. Stainless steel and aluminium have relatively close galvanic potentials as far as I can see. I have given up trying to source, or even understand (!) the imperial nut and bolt thread system; its far easier to walk into a bolt store and ask for M6 x 25mm bolts and M6 nuts. J
For structural parts you must however use AN fasteners and they are not too difficult to understand (unless you need to order a tap or die…) ; I order them directly from Aircraft Spruce in the US.
Johannesburg Jay
From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com) [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On Behalf Of Sacha
Sent: 26 March 2013 03:58 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: Blind riveting ground to airframe?
Does anyone know what the METRIC equivalent of an AN fastener is and where I can buy some? I'm in Italy, so preferably somewhere in Europe, though I'm willing to order from the US if necessary. I've been going nuts (no pun intended) trying to look for some but can only find a few manufacturers, nothing for the retail buyer.
On Mar 26, 2013, at 13:42, rayj <raymondj(at)frontiernet.net (raymondj(at)frontiernet.net)> wrote:
[quote]
Looks like a great source for fasteners. I wanted to be sure the ones I chose were to an specs. I ended up ordering a big assortment of small AN screws. If I could have gotten an stuff with 6 lobe recess, I would have prefered it. Definitely preferable to Phillips.
| Quote: | | Raymond JulianKettle River, MN. "And you know that I could have me a million more friends,and all I'd have to lose is my point of view." - John Prine |
On 03/26/2013 07:20 AM, William Schertz wrote:
[quote]
--> AeroElectric-List message posted by: "William Schertz" <wschertz(at)comcast.net> (wschertz(at)comcast.net)
Also note that they carry 100 degree flat head with Torx drive, much nicer for avoiding stripouts like phillips
Bill Schertz
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