Metallics JDIA12D Anchors 1/2-13 Drop-In Ancr St-zn (Jar 50)

The JDIA12D drop-in anchor is internally threaded 1/2-13, so it accepts a 1/2 inch diameter bolt or threaded rod with standard UNC coarse thread. The anchor itself stays flush in the concrete and the bolt threads into it, which lets you remove and reinstall the fixture without disturbing the anchor.

Concrete only. A drop-in anchor expands against solid material at the bottom of a drilled hole, so it needs poured concrete of adequate thickness. Hollow block, brick and drywall will not develop the expansion, and for those you want a hollow-wall or sleeve-type anchor instead. For 1/2-13 overhead rod hangers in a concrete deck, the JDIA12D is the right family.

Fifty anchors per jar. Metallics packs the JDIA12D in a jar of 50, which is the standard unit for this item, so order by the jar rather than the piece.

Steel with a zinc plating. That suits dry interior concrete work, strut and trapeze hangers, conduit racks and equipment bases. For wet, exterior or corrosive locations you want a stainless anchor instead, since zinc plating on carbon steel is a light corrosion coating, not a marine finish.

The difference is whether the threads stay in the hole. A wedge anchor is a stud that protrudes permanently, so the fixture has to slip over it. The JDIA12D drop-in is flush and internally threaded 1/2-13, so you thread rod or a bolt in afterward and can take the fixture back off later. That matters for electrical work where threaded rod lengths change, trapezes get re-hung, or you cannot have studs sticking out of a finished slab.

JDIA12D is the Metallics part number, and it covers the 1/2-13 steel zinc drop-in anchor supplied in a jar of 50. That is the number to quote on a purchase order or match against a submittal.