Metallics JFSD142 Anchor 1/4 x 2 FH Split Drv Ancr St-Z (Jar 50)

Split drive anchors like the JFSD142 are for solid masonry base material: poured concrete, brick, and the solid webbing of block. They are a hammer-in, non-adjustable anchor, so they rely on the hole wall staying intact. Avoid the hollow cells of block and avoid drywall or hollow tile, where there is nothing for the split shank to compress against. For hollow wall work you need a toggle or sleeve-type anchor instead.

No. The JFSD142 is a permanent hammer-drive anchor with a flat head, so there is no nut or screw to back off. Once the split shank is driven into the hole it is set. If you need something you can remove later, pick a machine-screw anchor or a sleeve anchor with a removable bolt instead. For electrical work, that permanence is usually the point: strap, conduit clamp, and box mounting that nobody is expected to take back off.

The JFSD142 is steel with a zinc plating, which is a mild corrosion-resistant coating meant for dry interior service. Zinc plated steel is not a substitute for hot-dip galvanized or stainless in wet, exterior, or corrosive locations. For exposed exterior masonry or a washdown area, specify a stainless or hot-dip anchor instead.

Each jar of JFSD142 holds 50 anchors, all 1/4 x 2 inch flat head split drive, steel with a zinc finish. That is a job-box quantity rather than a bulk carton, which suits a van stock for conduit strap and box mounting runs.

The JFSD142 has a flat head, which seats down against the fixture or strap you are fastening and leaves a low, broad bearing surface rather than a rounded dome. It is not a countersunk flush head, so plan for the head to sit on top of the material. If you are pinning a conduit strap, a clip, or a sheet metal bracket to masonry, that flat bearing is what holds it down.