Metallics CSH20F25 Anchors 1/4X1-3/4 Hwh Blu St-zn (JAR 25)

A 1/4 inch diameter concrete screw of this type is installed in a 3/16 inch hole drilled with a carbide-tipped masonry bit. No separate shield or expansion sleeve is used, the screw cuts its own thread in the masonry, so drill the hole deeper than the embedment you want and blow it clean before driving.

Yes. The hex washer head drives with a socket, so a 1/4 inch hex head screw like this runs off an impact driver or impact wrench with the matching socket. The washer face spreads the load on sheet metal straps and brackets, which is why this head style is the usual pick for conduit and channel work rather than a flat or pan head.

The CSH20F25 carries a blue coated steel-zinc finish, which is a corrosion-resistant coating intended for dry and damp interior masonry work. For direct exterior exposure, standing water, or coastal air, step up to a stainless concrete screw instead, since a zinc-based coating on carbon steel will eventually rust in those conditions.

No. This is a one-piece screw anchor, nothing else goes in the hole. You drill, drive it, and the thread cuts into the concrete, block, or brick. That makes it faster than a shield-and-lag setup, and it can be backed out and removed if the fixture has to come off later. The only consumable you need is the correct carbide masonry bit.

For a strap or clamp that is only a fraction of an inch thick, yes. Overall length on the CSH20F25 is 1-3/4 inches, so after the thickness of the fixture you still have most of that length going into the masonry. If you're fastening through furring, a thicker bracket, or any standoff, add that thickness to the embedment you want and move up to a longer screw in the same 1/4 inch diameter.