Metallics JFSD143 Anchor 1/4 x 3 FH Split Drv Ancr St-Z (Jar 50)

A split drive anchor is driven into a hole of the same nominal diameter as the anchor, so the Metallics JFSD143 at 1/4 inch diameter goes into a 1/4 inch hole drilled in concrete, block, or brick. Drill the hole deeper than the embedment you need so drill dust has somewhere to go, then hammer the anchor through the fixture and into the hole. There is no expansion nut or setting tool involved; the split tail compresses as it is driven and holds by spring tension against the hole wall.

No. The JFSD143 needs solid base material to grip, because the split shank relies on compression against the wall of the hole. In drywall, plaster, or the hollow cell of a block, there is nothing to compress against and it will spin loose or pull straight out. Use a toggle or a hollow wall anchor for drywall, and either hit the solid web of the block or use a sleeve anchor sized for hollow masonry.

Treat it as permanent. A split drive anchor like the JFSD143 holds by the spring tension of its split shank against the hole wall, so there is nothing to back out or loosen. If you need a fastener you can take off and reinstall, use a threaded anchor such as a sleeve anchor, wedge anchor with a nut, or a machine screw anchor instead. Split drive is for fixtures that go on once and stay.

The JFSD143 is zinc plated steel, which is a mild corrosion coating meant for dry interior service. It is fine in a conditioned building, a dry mechanical room, or an interior parking structure. For exterior walls, wash-down areas, pool rooms, coastal exposure, or anywhere it will see standing moisture or chlorides, go to a stainless anchor instead; plated steel will eventually rust through in those conditions and the holding value drops with it.

It is a one-piece hammer-in masonry fastener for mounting electrical components to concrete, block, and brick: conduit straps and clamps, device and junction box brackets, strut, panel backs, and ground bar mounts. The flat head on the Metallics JFSD143 sits down into a countersunk or punched hole so it does not stand proud of the fixture. Install is fast, no expansion hardware and no setting tool, just drill and drive.

Each jar holds 50 of the 1/4 x 3 inch flat head split drive anchors. For an MRO crib or a van stock, that is a practical count for strap and bracket work; order multiple jars where you are anchoring a long conduit run and need a fastener every few feet.

Metallics lists it as JFSD143, a 1/4 inch by 3 inch flat head split drive anchor in zinc plated steel, packed 50 to a jar. The JFSD prefix is the jar-packed split drive line, with the trailing digits reading as diameter and length, so adjacent sizes follow the same numbering pattern.