I have previously used Tapcon screws to attach wood (furring strips, studs, backing boards) to concrete block walls.
My experience with Tapcon is hit and miss. Sometimes the screws will bottom out and spins instead of lock tight and snugged.
Other times, I found that the screws would be driven tight into the block, holding a piece of 2x4 or 2x6. However, I am attaching other wood members to the piece of 2x4. If I am using a palm nailer or an impact driver, bang bang bang bang bang...after a while, the Tapcon would come loose a little. I can pry off the piece of 2x4 from the concrete wall.
So I tried using this hammer set anchor.
That seems to work pretty well. So far it's holding better than Tapcons.
The question I have is whether I have the right lengths.
Let's say I am attaching 2x4s to the concrete block wall. The 2x4 is 1.5" thick. The instructions says at least 0.5" embedding into the concrete. So I got 2" anchors.
However, since I will be attaching other things to the 2x4, and I need this to be flushed, I need to recess the round head of the anchor into the wood. So I drilled a 3/4" hole into the 2x4, about the depth of the anchor head, I am guessing it's about 3/8", so the anchor would protrude about 3/4" to 7/8" into the block. Is the 2" lengths good to use or should I be using 1-1/2"?