What is this fastener?
#10
And how does it work?

It looks like a nail with a washer:



Except the "washer" is a really tight fit and goes between the two pieces of wood, embedded in the lower (upper in the pic):



The head does not penetrate the surface of the top board but is embedded in it:



To remove it, I had to pry the boards apart. Scary from a salvage wood standpoint because I did not know these were in there until I pried the boards apart. I thought the boards were just held together by the regular nails which were also present.
Carolyn

Trip Blog for Twelve Countries:   [url=http://www.woodworkingtraveler.wordpress.com[/url]

"It's good to know, but it's better to understand."  Auze Jackson
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#11
Does the washer move at all? Or is it part of the nail? Looks like a double-headed nail.

Or maybe, considering its length it's a concrete nail. See this for some info: http://www.ramset.com.au/product/detail/...rete-nails
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#12
That nail is fired from a power actuated gun. It appears to be a HILTI brand so the gun would be a 27 caliber tool.
It is normally used to tie metal studs to a wall or floor
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#13
Ahhh. The first piece was a furring strip on a concrete wall. The second piece was nailed over it?
Carolyn

Trip Blog for Twelve Countries:   [url=http://www.woodworkingtraveler.wordpress.com[/url]

"It's good to know, but it's better to understand."  Auze Jackson
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#14
MsNomer said:


Ahhh. The first piece was a furring strip on a concrete wall. The second piece was nailed over it?




That is the most likely: It did not set fully

Joe
Let us not seek the Republican Answer , or the Democratic answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future  John F. Kennedy 



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#15
To me that looks like a masonry nail, the nails and the applicator was sold by Sears ( craftsman ) Do not know who the manufacture was.
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#16
woodcutter199 said:


That nail is fired from a power actuated gun. It appears to be a HILTI brand so the gun would be a 27 caliber tool.
It is normally used to tie metal studs to a wall or floor




^^^^ This. A powder actuated nail gun fires these.
Ramset & Hilti are just a couple of the companies that make them.
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#17
Makes sense considering that this was salvaged from a college dorm that would have had cement block walls.
Carolyn

Trip Blog for Twelve Countries:   [url=http://www.woodworkingtraveler.wordpress.com[/url]

"It's good to know, but it's better to understand."  Auze Jackson
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#18
You may want to disinfect the wood considering the source
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