Metallics CSF2F Anchors 3/16 X 1-3/4 Fh Ph Blu Conc Sc St-zn (Jar 100)

Hollow block, yes, if you hit the solid web rather than the void, and the 1-3/4 inch length gives you room to get through the face shell with thread engaged. Drywall or plaster with no masonry behind it, no. Threads on a concrete screw need a hard, brittle base material to cut into, so use a toggle or a self-drilling drywall anchor there instead.

No plug or shield is needed. Concrete screws like the CSF2F thread directly into a drilled hole in masonry, so you drill, blow out the dust, and drive the screw. That also means they can be backed out and the fixture repositioned, which a wedge or sleeve anchor will not let you do.

The flat head Phillips on the CSF2F sits down into a countersunk or punched hole so the fixture mounts flush, which matters when a box, plate, or strap has to sit tight to the wall or something else stacks on top of it. A hex washer head stands proud and is driven with a nut setter instead, so pick that style when you are clamping a strap or channel and want more bearing surface under the head.

The CSF2F is zinc plated steel with a blue coating, which handles dry interior and sheltered conditions. For a permanently wet exterior, a coastal site, or anywhere in contact with treated lumber, specify a stainless concrete screw instead, since plated carbon steel will corrode in those spots.

They ship 100 to a jar. That is the stock pack for this item, which suits a service van or an MRO shelf where you are pulling a handful at a time rather than anchoring a full job.

Order Metallics part number CSF2F. That number covers the 3/16 by 1-3/4 inch flat head Phillips blue concrete screw in zinc plated steel, packed 100 per jar, and it is the only configuration under that number.