[rebel-builders] R4412 rivet strength, weather stripping
Posted: Sun Feb 19, 2012 4:16 pm
Ken
Thanks for the actual numbers. Good points.
off-topic....
I was surprised to learn that the rivet widely used on the Zenith is the
R4412, without countersinking the holes. They use a funkified (concave)
riveting head tool that causes the crown of the 4412 to knurl over. I
guess the thinking is that it increases tensile strength and maybe slightly
lower profile still. I can't see messing with a rivet manufacturer's
design myself. ...also can't see messing with a Zenith ;)
-Ben
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Thanks for the actual numbers. Good points.
off-topic....
I was surprised to learn that the rivet widely used on the Zenith is the
R4412, without countersinking the holes. They use a funkified (concave)
riveting head tool that causes the crown of the 4412 to knurl over. I
guess the thinking is that it increases tensile strength and maybe slightly
lower profile still. I can't see messing with a rivet manufacturer's
design myself. ...also can't see messing with a Zenith ;)
-Ben
Well...
The Low Profile head is rated165 lb shear and 230 lb tension.
True the c.s. head is rated 155 lb shear and 205 lb tension.
The shear number is generally the important one for us so the c.s. is
94% the strength of the low profile dome head. There are some reports of
the c.s. heads separating prematurely but there are other claims that
the c.s. head adds shear strength.
Personally I would not give it a second thought. I believe the rivets
are fully interchangeable and both have more than adequate safety
factor. I'm pretty sure MAM has said the same thing but ask them if you
are concerned. With thin skins the rivets are not the weak link in most
cases. ie extra rivets are there to reduce tearout, not because that
much rivet strength is needed.
Ken
bransom@dcsol.com wrote:
Damn. I just dimpled all around one side last night, wondering brieflyRemember those RV4412's heads are no where near as strong as the domed
1410's. I use them in as few a places as possible.
about the comparative strength. Lay in bed thinking I might just put
solids in there, and so now I guess I will order some and go that route.
Educational (Doh!) -- thanks, Wayne.
-Ben
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