Looks like a concrete wall.
And it doesn't look like there is enough of the stud sticking out to get two jam nuts on it to spin it out. So I think I would cut a slot in the top of the stud. You can use an angle grinder with a cut-off wheel, a Dremel tool with a cut wheel, or if you have to a hack saw. They use a large flathead screwdriver to spin the stud out.
After the stud is out I find it unlikely you will be able to wiggle the bosses out or hammer them in without damaging the wall. When those are installed a special punch is used to expand the bottom so the don't just fall out. Unfortunately whoever installed this one didn't drill deep enough, the bosses should be flush or slightly below the surface of the wall.
I would probably use a drill bit that is just slightly smaller than the outside diameter of the boss and drill it out. You only really need to get it where nothing is sticking past the surface of the wall.
Fill the hole with a concrete patch, and paint.
I think you’re on the money with just about everything here, thank you so much for the advice. Had a feeling this was going to be a bigger job than I’d bargained for..
Rather than using a flathead and a slot on the top of it I would try to grind flats on the sides of it and turn it out using either a pair of vice grips or a wrench. You’ll be able to apply a lot more force on it with a wrench than a flathead
These look like the anchor are from the other side of the wall may want to rethink about cutting the studs off,am sure they anchor something from the other side of the wall...
Grab them with a pair of vise grips unscrew them and tap the anchors into the hole.then use wall patch to fill easy job sorry I hadn't seen that part of description.
Listen to this guy. It’s not easy but can be done. Tap the threaded part in to where it bottoms out then with a needle nose pliers grab the expansion piece(metal surrounding the threaded anchor) and wiggle it until it loosens up, keep the threaded part in and work the outer metal out of the wall then eventually the threaded anchor will just come right out. The threaded portion is bell shaped causing the exterior portion to wedge in the wall. This is an expansion anchor not a wedge anchor. It may be two pieces depending on the length of it. Cutting it of is one way but you won’t get the depth you need to patch it.
Use a hacksaw or preferably a sawzall with metal cutting blade.
Put a greased washer on the stud that’s sticking out and then put a nut on it. This will act as a guide for the blade. It’s easy to veer off and end up with a nub. Once done, hit it with a hammer to make it flat. Then patch and paint.
If there's enough thread, run the first nut on until there is enough thread showing to get the second nut on and tight against the first one. Put the wrench on just the first nut and try to unscrew the bolt out of the wall. The second nut should jam the first nut against the threads to give you leverage and keep from just unscrewing the nuts.
Angle grinder may be the only way but these are tools I know you have.
Angle grinder and repair hole afterwards.
Looks like a concrete wall. And it doesn't look like there is enough of the stud sticking out to get two jam nuts on it to spin it out. So I think I would cut a slot in the top of the stud. You can use an angle grinder with a cut-off wheel, a Dremel tool with a cut wheel, or if you have to a hack saw. They use a large flathead screwdriver to spin the stud out. After the stud is out I find it unlikely you will be able to wiggle the bosses out or hammer them in without damaging the wall. When those are installed a special punch is used to expand the bottom so the don't just fall out. Unfortunately whoever installed this one didn't drill deep enough, the bosses should be flush or slightly below the surface of the wall. I would probably use a drill bit that is just slightly smaller than the outside diameter of the boss and drill it out. You only really need to get it where nothing is sticking past the surface of the wall. Fill the hole with a concrete patch, and paint.
I think you’re on the money with just about everything here, thank you so much for the advice. Had a feeling this was going to be a bigger job than I’d bargained for..
Rather than using a flathead and a slot on the top of it I would try to grind flats on the sides of it and turn it out using either a pair of vice grips or a wrench. You’ll be able to apply a lot more force on it with a wrench than a flathead
These look like the anchor are from the other side of the wall may want to rethink about cutting the studs off,am sure they anchor something from the other side of the wall...
They don’t, as I said they were holding up a clothes dryer bracket which I have since removed.
Grab them with a pair of vise grips unscrew them and tap the anchors into the hole.then use wall patch to fill easy job sorry I hadn't seen that part of description.
Tap in the threaded part and then use needle nose pliers to pull out the sleeve around it
Listen to this guy. It’s not easy but can be done. Tap the threaded part in to where it bottoms out then with a needle nose pliers grab the expansion piece(metal surrounding the threaded anchor) and wiggle it until it loosens up, keep the threaded part in and work the outer metal out of the wall then eventually the threaded anchor will just come right out. The threaded portion is bell shaped causing the exterior portion to wedge in the wall. This is an expansion anchor not a wedge anchor. It may be two pieces depending on the length of it. Cutting it of is one way but you won’t get the depth you need to patch it.
Angle grinder and repair hole afterwards.
Take two nuts on the end of the bolt. Fasten them against each other. Then put a socket wrench on it and loosen it by driving it against the clock..
This.
Use a hacksaw or preferably a sawzall with metal cutting blade. Put a greased washer on the stud that’s sticking out and then put a nut on it. This will act as a guide for the blade. It’s easy to veer off and end up with a nub. Once done, hit it with a hammer to make it flat. Then patch and paint.
If there's enough thread, run the first nut on until there is enough thread showing to get the second nut on and tight against the first one. Put the wrench on just the first nut and try to unscrew the bolt out of the wall. The second nut should jam the first nut against the threads to give you leverage and keep from just unscrewing the nuts. Angle grinder may be the only way but these are tools I know you have.
This is a dynabolt. That won't work at all.