bracketsmetal
I was searching for this a particular corner brace/bracket, but it seems that they are impossible to find.
I couldn't them at home depot or at amazon. I'm not sure if they just don't exist or if I'm looking for them incorrectly.
This is it:
I posted a similar question, and it helped because it showed me an alternative, but in this case I want to find this specific bracket that will hold three walls together.
If it really must be attached to the wall, I would go with heavy-duty shelf brackets, like these:
The 16"x18" version like this one at Home Depot is rated for 600 lbs each.
I would use two, anchoring each to a stud with lag bolts. I would then bridge between them with 3/4" plywood, and probably a 2x4 on top of the plywood at the point you want to attach the heavy bag.
Using two plus the plywood platform would keep the brackets from racking as the bag swings.
Simple solution - have the 50mm packing between the bracket and the wall, and use long bolts which pass through this packing.
Best Answer
There is this one on Amazon: https://smile.amazon.com/dp/B071W4VQPT You are working with a 20x20 tile and these are 2.25" Roughly
These ones: https://smile.amazon.com/dp/B0195UGD38 They are much larger, though WAY more Expensive.
Though you will see those Brackets. You could use something like this on the Inside with some Galv Bolts or SS Screws to make it look nicer. https://smile.amazon.com/dp/B07CWMSS79
I'd put two on each adjoining edge. so 2 in each corner and 2 on each side on the bottom.