Metallics CSF2SS Anchors 3/16 X 1-3/4 Fh Ph Conc Scr SS (Jar 100)

A 3/16 inch concrete screw like the CSF2SS is installed in a 5/32 inch hole drilled with a carbide bit. Drill deeper than the embedment you want so the dust has somewhere to go, then drive the screw with a Phillips bit. No separate shield or plug is needed, the thread cuts into the masonry itself.

Yes, and that is the reason to pick the CSF2SS over a blue-coat carbon steel version. Stainless holds up on exterior walls, parking structures, wash-down areas, and coastal sites where a plated concrete screw will rust at the head and stain the concrete. For dry interior conduit and box work either will do.

Only in a countersunk hole. The CSF2SS has a flat head, so it seats flush in material that is countersunk or in a pre-punched tapered hole, such as a flat-head channel or a plate. Against a flat sheet steel bracket the head will stand slightly proud. If you need a bearing surface on flat stock, a hex washer head concrete screw is the better choice.

Concrete screws like this 3/16 inch stainless one hold in solid concrete, the solid web of CMU, and solid brick. In the hollow cells of block there is nothing for the thread to cut, so use a toggle or a screw anchor rated for hollow masonry there instead. Avoid driving within a few inches of a block edge or mortar joint.

100 pieces per jar. For an electrician stocking a van, one jar covers a lot of strap and box work; the jar keeps them from spilling in a bag the way a bulk box does.