Metallics CSF70F Anchors 1/4 x 5 Flat Hd Phil CS Blue St-zn (Jar 100)

Flat head is the countersink style, so it seats flush in a countersunk hole or in hardware with a chamfered hole, such as strut, clips, or a bracket with a beveled seat. Against a flat unchamfered surface it will stand slightly proud. If you want a washer-faced bearing surface instead, a hex washer head screw is the one to use.

The CSF70F carries a blue zinc coating, the standard finish on concrete screws for general interior and protected exterior anchoring. Zinc plating is not a marine or permanently wet duty finish, so for continuous moisture, coastal exposure, or treated lumber contact, step up to a stainless concrete screw instead.

That is exactly what this length is for. A 5 inch 1/4 inch concrete screw gives you enough length to pass through strut, a standoff, firring, or a thick backing board and still reach embedment in the concrete or block behind it. For attaching hardware directly against the slab with nothing in between, a shorter 1/4 inch screw is the better choice; 5 inches of thread in a shallow hole just wastes drilling.

No. This is a concrete screw, so it taps its own thread in the masonry and goes in with a Phillips bit or driver, no plug, sleeve, or setting tool required. That also means it can be backed out and the fixture removed without destroying the hole, which is why crews use them for temporary bracing and for anything that may need to be reopened.

One hundred screws per jar, packed in a jar rather than a box, which is the format most electrical and MRO crews keep on the truck for loose pickup. If a job needs more than a hundred 1/4 x 5 anchors, order multiple jars.