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I am trying to relocate the electrical junction box mounted on concrete wall, and there is a fastener that does not have screw head. It looks nail but with washer underneath which I have not seen before.

Wall-mounted junction box with a rivet-like attachment to the wall

I tried to drill a hole to the fastener on the other side but with no success.

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    Think it is called a ramset nail. Uses a special tool to drive nails into cement. Will probably need to grind the head off if you want that box. If replacing the box, using a long ply bar behind the box should pull it out, but the box will not be pretty anymore.
    – crip659
    Dec 23, 2022 at 18:51

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I have come across the same problem with Hilti fasteners. BE SURE TO WEAR SAFETY GLASSES when doing this. I have a diamond wheel for my Dremel hand tool. The nail metal is very hard and appears to be brittle. I put a notch and then hit it with a cold chisel, they usually pop off. I will then cut the cement back, repeat the process and fill the hole with cement patching compound.

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It looks as if you will have to grind or chisel that head off. Be sure the power is off, wear your safety glasses and good luck.

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I ended up prying the whole box with hammer from the back.

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  • Can use tapcon screws to install the new box, if it will be on cement wall also. Makes removing again easier.
    – crip659
    Dec 23, 2022 at 20:24

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