The table below snipped from one manufacturer's specs would show the 3/8' anchors you're considering are specified for 1-1/2' embedment, at 1-1/4' you're a little shy. Since you seldom know the strength of the block, it's best to err towards the low end.

Not all block is created equal - some are really strong, some are not.

The anchor specs will give different numbers for different concrete PSI.

That will limit the strength of your attachment. When anchoring into the middle of a cell - the hollow part - you have limited thickness of material - the standard thickness being 1-1/4' - so you have limited depth of embedment. If you read the specs for most concrete anchors, the strength depends on the depth of embedment and the strength of the concrete. There is good but not perfect sound isolation between the townhouses and this is an adjoining wall. We also do not know if they are filled or not. Here is my concern: On this website for the bolks I'm thinking of using, the website says 'Do not use in brick or blocks.' So my question is this: are all wedge expansion bolts contraindicated for all concrete blocks, or just the ones that I'm looking at? If they are all contraindicated, then how do I mount the thing?ĮDIT: I am in a townhouse and we do not know if there is a single row of blocks between the units or two. A 300 pound person jumping up and grabbing on the bar may pull 2g, so that's 600 pounds of force, and double it for the 30' cantilever, so 3/8' concrete expansion bolts should be fine. Only the top four will have pull-out loads (the arrangement is two holes on the top of each of the two brackets and one hole on the bottom). According to websites, 3/8' concrete expansion bolts have pull-out strength of roughly 1000 lbs. However, my sense is that using 1/2' bolts will require perfect alignment. So I'm looking at 5' long wedge compression bolts. Concrete block walls are 1.5' wide on average, so I'm at 4' of depth and then I put on the bolt. The pull-up bar is made with 1' steel tube. 5' of strapping on it, and 1' drywall over that. I want to hang a Rogue P-4 pull-up bar from a wall.

Hilti anchors for hollow concrete block