Metallics JDEA12 Anchors 1/2 Dbl Expand Zn-al (Jar 25)

The JDEA12 is the 1/2 inch size, so it accepts a 1/2 inch machine bolt or threaded rod. Double expansion anchors are set in a drilled hole in concrete, block, or brick, and the bolt draws both expander cones outward against the hole wall.

No. The jar contains the 1/2 inch anchor bodies only. Supply your own 1/2 inch machine bolts or threaded rod cut to the length your fixture and embedment require, plus nuts and washers if you are going through with rod.

Twenty-five anchors per jar. It ships as a jar pack, which is the usual format for keeping one size of masonry anchor on a service truck or in an MRO crib.

They are zinc-aluminum alloy, not plated steel, so the corrosion resistance is in the body of the anchor rather than a coating that can be scratched off during installation. That makes them a common choice for interior concrete work including damp areas like mechanical and pump rooms. They are not represented here for exterior or submerged use.

Double expansion is the one to reach for in softer or lower strength base material, concrete block, brick, or old crumbly concrete, because the load spreads over two expanding cones along the length of the hole instead of one. In sound, high strength poured concrete a single expansion anchor is usually enough. The JDEA12 is the 1/2 inch double expansion version.

That is the normal application. Metallics carries the JDEA12 as an electrical fastener, and 1/2 inch expansion anchors are standard for anchoring strut channel, trapeze hangers, and heavier conduit racks into concrete. Match the bolt or rod length to your strut and fitting stack, and drill the hole to the anchor manufacturer's stated diameter and depth.

No. The JDEA12 is a solid base material anchor, it needs concrete, brick, or the solid portion of block to expand against. In drywall or a hollow cell you want a toggle or hollow wall anchor instead, not a 1/2 inch expansion shield.