Metallics J3124SS Anchors 5/16 x 2-1/2 Hex Nut Sleeve SS (Jar 100)

The J3124SS is a 5/16 inch diameter sleeve anchor, so the hole in the concrete or masonry is drilled at 5/16 inch with a carbide bit. Sleeve anchors are drilled to the anchor's nominal diameter, and the anchor body is driven through the fixture into the hole. Total anchor length is 2-1/2 inches, so drill deeper than your fixture thickness plus the required embedment.

Yes. The J3124SS is a stainless steel sleeve anchor, which is why it gets specified outdoors, in wash-down areas, near pools, and in coastal or corrosive environments where a zinc-plated carbon steel anchor would rust and stain the substrate. For dry interior work, a plated anchor would do the same mechanical job, but stainless is the one you want anywhere moisture reaches it.

Sleeve anchors like the J3124SS work in solid concrete, brick, and block because the sleeve expands against the wall of the hole along its length rather than relying on a single point of bite. In hollow block, set the anchor in the solid web rather than the void, or the sleeve will have nothing to expand against. The 2-1/2 inch overall length gives you room for a fixture plus embedment in a solid base material.

It is a hex nut style sleeve anchor, so the hex nut and washer are part of the assembly. You tighten the nut to expand the sleeve against the hole wall. Nothing else needs to be ordered to set the anchor beyond a 5/16 inch carbide bit, a hammer, and a wrench.

They ship 100 to a jar. The jar pack is the standard put-up for this anchor, which suits electrical and MRO crews setting strut, conduit racks, panels, or equipment feet in volume rather than buying a handful at a time.

Order it as Metallics J3124SS. That number covers the 5/16 by 2-1/2 inch stainless steel hex nut sleeve anchor in the 100 count jar; the SS suffix is the stainless material call-out.

You can back the hex nut off and take the fixture down, which is the advantage of a nut style sleeve anchor over a drop-in or a wedge with a cut-off stud. The expanded sleeve itself stays in the hole; it does not pull back out once set. If you need the wall clean afterward, plan on cutting the stud flush and patching.