Metallics JSEA12 Anchors 1/2 Sgl Expand Zn-al (Jar 25)

The JSEA12 is a 1/2 inch single expansion anchor made of zinc-aluminum alloy, packed 25 to a jar. The 1/2 inch designation is the bolt or threaded rod size the anchor accepts, not the hole size, so you'll be drilling a larger hole than 1/2 inch to set it.

No. The JSEA12 is a single expansion anchor, which works by wedging against the walls of a drilled hole in solid base material. Drywall and hollow cells give it nothing to bear against. For drywall you want a toggle or self drilling drywall anchor, and for hollow block a toggle bolt or a double expansion anchor set in the solid web.

The jar contains 25 anchor shells only. A single expansion anchor is a female fastener: you supply the 1/2 inch bolt, machine screw or threaded rod, cut to the length your fixture and embedment need. Ordering the anchors without matching 1/2 inch bolts on the same ticket is the most common way this part shows up on a job unusable.

A single expansion anchor like the JSEA12 expands at one end as the bolt is tightened, and it is the usual choice for solid, high strength base material such as poured concrete. Double expansion anchors expand along their full length and are the better pick in softer or less consistent material like block, brick or older low strength concrete, because the grip is spread over more of the hole. Both are female anchors, meaning you thread a bolt or rod into them rather than driving them.

Metallics catalogues the JSEA12 as an electrical fastener, and a 1/2 inch female expansion anchor is the standard way to hang threaded rod off a concrete deck for strut, cable tray, conduit racks and large junction boxes. Thread the rod straight into the anchor so the assembly can be dropped to whatever length the run needs.

Order it as Metallics JSEA12. That part number covers the 1/2 inch zinc-aluminum single expansion anchor supplied 25 to a jar, so a quantity of one is 25 pieces, not one anchor. Size that into your count before you order for a deck full of rod drops.

The JSEA12 body is a zinc-aluminum alloy, which is corrosion resistant enough for typical interior concrete work and incidental damp. For sustained wet, exterior or chemically aggressive conditions, stainless hardware is the usual call. Also note the bolt or rod you thread into the anchor is a separate purchase, so match its plating to the anchor's environment.