Metallics CSF3F Anchors 3/16 X 2-1/4 Fh Ph Blu Conc Sc St-zn (Jar 100)

Blue concrete screws like the CSF3F thread into poured concrete, hollow and solid block, and brick, as long as the hole is drilled to the matching diameter and the base material is sound. They are not for drywall, wood, or hollow metal studs. For mounting into block webs, keep the anchor in the solid web rather than the void.

The flat head Phillips on the CSF3F sits flush when driven into a countersunk hole or a punched flat-head fixture hole, so nothing protrudes to foul a cover, a panel back, or a trim plate. Hex washer heads hold more surface against strut and straps and drive faster with an impact, but they stand proud. Use the flat head where the fastener must sit flush.

The CSF3F is steel with a zinc coating, which suits dry interior work, utility rooms, and covered exterior locations. Direct weather exposure, wet areas, or coastal and chemical environments will corrode zinc plating over time; use a stainless or heavier coated anchor there instead.

They ship 100 to a jar, packed as a jar rather than a carded or bulk box. That quantity suits a crew stocking a van or a maintenance shop pinning straps, boxes, and strut through a floor of work without reordering mid-job.

The CSF3F backs out with a Phillips driver, which is the main advantage over a drop-in or sleeve anchor, so temporary bracing and layout work is practical. Reusing the same screw in the same hole gives up holding power because the threads have already cut the concrete. For a permanent fixture, drill a fresh hole or move over and use a new screw.