What kind of nail is this

[Mikael_L]

And what is it used for?

I stumbled across a box with these at a construction site. I don't know which professional group used it, or for what. But I'm curious about what it is for.

 

[Fotografen]

Actually, I don't know, but I can imagine that it is for temporary constructions that are to be demolished, such as molds.

 

[Byggerbo]

Double-headed nails are used for temporary constructions. For example, formworks, braces, etc. You drive the nail to the first head and then easily pull it out using the second head.

 

[Rickard.]

They are also used for attaching items like drains and similar in arched tables. They are made of aluminum (maybe steel exists too) and it's very easy to break off the point that sticks out from the concrete when the table is moved.

 

[Staffans2000]

It is used when you want to easily pull out the nail again. For example, when nailing formwork. I personally call it "formspik".

 

[C.Lundin]

They are also used to attach things like drainage and similar in arch tables. They are made of aluminum (maybe steel as well) and it is very easy to break off the tip that protrudes from the concrete when the table is moved.

The one in the picture and others used for temporary constructions are always made of steel. Carbon steel, I believe, if we're being precise.

 

[tergo]

Double-headed nails were widely used in the 60s and 70s for strap iron that was used to fasten wall forms together, making it easier to dismantle the forms after casting.

 

[richardtenggren]

I think you often see these on American/British construction programs, I've thought that they would be really handy for temporary fastenings, but never seen them in stores.