Metallics CSF10F Anchors 1/4 X 1-1/4 Fh Ph Blu Conc Scr St-zn (Jar 100)

The CSF10F is a 1/4 inch diameter concrete screw, and 1/4 inch concrete screws of this style are installed in a 3/16 inch carbide hole. Drill the hole deeper than the embedment you need so dust has somewhere to go, blow it clean, then drive the screw with a Phillips bit. No separate anchor or shield goes in the hole, the screw cuts its own thread in the masonry.

Flat head Phillips, which is what the CSF10F is, sits flush or countersunk and is the one to use where a bracket, channel, or plate has a countersunk hole and nothing can stand proud of the surface. If you are strapping conduit or hanging unistrut and want to run the screws fast with an impact and a socket, a hex washer head version of the same 1/4 inch concrete screw is the easier driver and gives a bearing surface against the fixture.

Concrete screws of this type are rated by the manufacturer for solid concrete, and they are commonly driven into solid brick and the webs of concrete block. Hollow block cells and drywall are not base materials for them, you need a toggle or a sleeve anchor there. The CSF10F is a 1/4 inch screw, so keep it away from the edge of the slab or the mortar joint to avoid spalling the hole out.

These are steel with a zinc plating and the blue coating typical of concrete screws. Zinc plating is a mild-service finish, fine for dry interior work such as mounting strut, boxes, and straps indoors. For exterior walls, parking structures, wet mechanical rooms, or anywhere pressure treated lumber is involved, specify a stainless or heavier coated concrete screw instead.

The manufacturer part number is CSF10F from Metallics, a 1/4 by 1-1/4 inch flat head Phillips blue concrete screw in zinc plated steel, 100 to a jar. Order against that number to keep one fastener standardized across a facility rather than ending up with mixed head styles that need two different drivers on the cart.

They ship 100 to a jar, which is the pack an electrician or maintenance tech keeps on the truck for conduit straps, box mounting, and strut. The jar keeps the count contained rather than loose in a bin, so it restocks cleanly for an MRO crib.

Concrete screws like the CSF10F back out with a driver, which is their advantage over a wedge or drop-in anchor when a fixture has to come off later. Reusing the same screw in the same hole is poor practice, the threads it cut are already formed and the hold drops off. Pull a fresh screw from the jar of 100 and, where you can, move a short distance off the old hole.