Metallics CSH50SS Screws 1/4 x 3-1/4 HWH 5/16Hd Concret (100pcs)

No shield, sleeve, or plastic anchor is needed. A 1/4 inch concrete screw like the CSH50SS taps its own thread into a 3/16 inch hole drilled with a carbide hammer bit, and drives straight in. Drill the hole deeper than your intended embedment so dust has somewhere to go, and blow it clean before driving.

Use a 5/16 inch hex socket or nut driver in an impact driver or drill. The CSH50SS has a hex washer head sized for a 5/16 inch socket, so no Phillips or Torx bit is involved and the washer face seats the fixture without a separate washer.

That is exactly the duty they are stocked for. These are electrical fasteners for anchoring into concrete and masonry, and the 3-1/4 inch length gives enough reach to pass through strut channel, mounting plates, backboards, or furring and still carry useful embedment in the base material. For thin items like a single conduit strap, a shorter concrete screw is the tidier choice, since the extra length just bottoms out in a deeper hole.

Concrete screws of this type thread into poured concrete, hollow or solid block, and brick, as long as you drill with a carbide hammer bit and land in solid material rather than a mortar joint or a block web. In hollow block, aim for the face shell thickness you actually have. They are not a drywall or wood fastener.

It ships as a 100 piece box under part number CSH50SS. There is one configuration, so the only thing to confirm is that you want the 1/4 by 3-1/4 inch size rather than a shorter length.