What kind of bolt is this?

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Old 06-22-19, 11:05 AM
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What kind of bolt is this?

we are about to fill in two small doorways and redo our fireplace. In our way is this bolt which is holding up a metal door frame. We have already cut the metal door off but I canít find anything to take this bolt off. Anyone have any idea what this is called or how to take them off? I would just cut them but I donít know how deep they are or if I can get the saw blade in without bending the blade.

I would post post a picture but I canít find the option on my phone. So the bolt or screw whatever it is is in the shape of an hourglass almost. Meaning the flat part of the bolt head is an hourglass and the raised parts on the bolt head are two triangles one on each side.
 

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06-22-19, 11:19 AM
Pilot Dane
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It is an anti-tamper screw/bolt designed not to be removed. Easiest is to use a grinder and grind the head completely off but that will leave the screw in the wall. If you want to unscrew it you can use a Dremel or die grinder to cut a slot in the head for a flat blade screwdriver.
 
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Old 06-22-19, 11:09 AM
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Pic of the bolt

Here is a pic of the bolt
 
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Old 06-22-19, 11:19 AM
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It is an anti-tamper screw/bolt designed not to be removed. Easiest is to use a grinder and grind the head completely off but that will leave the screw in the wall. If you want to unscrew it you can use a Dremel or die grinder to cut a slot in the head for a flat blade screwdriver.
 
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Old 06-22-19, 12:15 PM
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Looks like that will be more of a project than the actually doorway. Thank you though.
 
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Old 06-22-19, 12:37 PM
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A few options, depending on your skills and tools-

The first choice is usually to get a pair of locking vise-grip pliers to grab the screw head and carefully unscrew it until it is far enough out to use regular pliers.

Next choice is to use a Dremel and cutting wheel to grind that 45 degree slope into a 90 degree slope so that you can use a regular screwdriver.
If that doesn't work, then use the Dremel to cut across the top and bottom of the low "hour-glass" area to create 2 parallel flat spots to get a grip with vise-grips.

Final option is to find a scrap screwdriver and solder the tip of the screwdriver to the head, unscrew it, then un-solder the screw.
 
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Old 06-22-19, 05:21 PM
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Final option is to find a scrap screwdriver and solder the tip of the screwdriver to the head, unscrew it, then un-solder the screw.

That would be nearly impossible to do without a massive soldering iron or a torch.
They do make a removal bit for those screws and many of those inexpensive "off shore" kits come with it but it's easier to grind a slot and to use a flat head screwdriver.
 
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Old 06-22-19, 06:29 PM
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Originally Posted by PJmax

Originally Posted by Hal_S
Final option is to find a scrap screwdriver and solder the tip of the screwdriver to the head, unscrew it, then un-solder the screw.
That would be nearly impossible to do without a massive soldering iron or a torch
Correct, plumber's torch.
Trick is to over-tin the screwdriver tip first so the excess solder flows downward,
clean and flux the screw head,

Works best when you can arrange to have the screw vertical, but for a kludge-fix
I'd try having the screwdriver blade sideways at 1'o-clock to the screw.

Admittedly difficult to do WELL. Heard about it from a retired autobody specialist who did lead-work and could solder pulling rings onto steel fenders.
"Why are you messing with a single screw? Solder it to a screwdriver and turn it out"...
 

Last edited by Hal_S; 06-22-19 at 06:53 PM.
 

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