I am looking for suggestions on the best way to mount some wall cabinets to a concrete block wall. These will be 30-by-72-inch MDF wall cabinets. I was thinking about lag bolts.
There are numerous fasteners that will work for this. If this is a concrete block wall, are the cells grouted or not? If they are, then Tapcons work great, or even a shielded lag of one sort or another. Use some construction adhesive behind what you attatch to the wall, for extra strength.
Hilti makes one in a 2-1/8-inch length that is great; it can't be beat. The center pin is threaded so that you can back it out with a screwdriver if necessary, something the lead shields (zymacs) don't offer. It is actually quicker than the screws. We just use the same pilot bit that we use to gang cabinets up, place the cabinet on the wall and go through everything with a 1/4-inch masonry bit, using a good hammer drill, and then drive the anchor home with a hammer. No studs to find.
When properly installed, you will either tear the back off the cabinet or the head off the anchor, but you won't pull it out, no matter what. And the installer will know whether it bites or not right away; no excuses there. They work on any solid wall.