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  #1  
Old 01-19-2010, 09:39 AM
Bob Hoffman Bob Hoffman is offline
 
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Posts: 206
Default soft alum rivets

Over the weeking I was getting ready to fit the two halves to my cowling when I realized I need to order the required "soft" rivets. I understand I'll need two sizes , does anyone have the proper numbers for these??
Went on to Vans site and only found "AD"'s, it is my understanding that I'll need "A"'s (soft) am I wrong ?
Bob
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  #2  
Old 01-19-2010, 12:09 PM
Stevea Stevea is offline
 
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Location: San Jose, CA
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Default

Correct, you want 'A' rivets. More specifically:

AN426A-x-y (or MS20426A-x-y)

where x=diameter in 32nds
and y=length in 16ths

'A' == 1100 aluminum (soft)
'AD' = 2117 aluminum

more info at: http://www.gen-aircraft-hardware.com...olidrivets.pdf


Aircraft Spruce and Genuine Aircraft Hardware carry them.


Edited:
Doh! Cowling..........the critical word here is cowling. As Scott McDaniels says below.......soft rivets are not called out on the cowling. AD rivets work fine on the prepreg (epoxy) cowling.
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Last edited by Stevea : 01-19-2010 at 06:25 PM.
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  #3  
Old 01-19-2010, 03:00 PM
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Noah Noah is offline
 
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Are these rivets called for in the plans? If so why doesn't Vans supply them? Or is this a change you are making?
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  #4  
Old 01-19-2010, 03:27 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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[quote=Stevea;398097]Correct, you want 'A' rivets. More specifically:

AN426A-x-y (or MS20426A-x-y)

QUOTE]

Not correct.

The AD rivets work just fine in the prepreg (harder material) cowling. That is why "A" rivets are not supplied nor are the called out in the plans.
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  #5  
Old 01-20-2010, 06:42 AM
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robertahegy robertahegy is offline
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I used the normal AN rivets in my prepreg cowl and had no issues squeezing them into counter sunk holes. I countersunk a little extra and was able to easily bury the heads for a nice, clean resolve. None ever loosened in the five years I owned the plane. I never saw any notes on using any alternative or soft rivet.

Roberta
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  #6  
Old 01-20-2010, 09:41 AM
Bob Hoffman Bob Hoffman is offline
 
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Wow! Thanks everyone, good catch , Here is what happened.The original cowling was the "old" style and used the "soft" rivets,this is being replaced by the "new " style cowling , but I didn't realize that the rivet requirements would change.
Thanks for catching my mistake.
Bob
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  #7  
Old 01-20-2010, 09:48 AM
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Mel Mel is offline
 
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Quote:
Originally Posted by Bob Hoffman View Post
Here is what happened.The original cowling was the "old" style and used the "soft" rivets,this is being replaced by the "new " style cowling , but I didn't realize that the rivet requirements would change.
Thanks for catching my mistake.
Bob
I used standard AD rivets in my "old" cowling and 17 years later they still look great.
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<rvmel(at)icloud.com>
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