Metallics J1537 Anchors Sprg Wing TogBt 1/4" Trd 20 Lgt 4" (Jar 50)

The Metallics J1537 is a spring wing toggle bolt with a 1/4 inch diameter machine screw thread, 20 threads per inch, and a 4 inch bolt length. The 4 inch length is what gives you enough reach to pass through the wall, let the wings spring open behind it, and still have thread left to clamp your fixture.

Spring wing toggle bolts like the J1537 are made for exactly that: hollow substrates such as drywall, plaster, and hollow block where there is nothing solid to screw into. You drill a hole large enough for the folded wings, push them through, and the spring opens them against the back face of the wall. In solid concrete or brick there is no cavity for the wings to open into, so a sleeve or wedge anchor is the right choice there instead.

Fifty pieces, packed in a jar. That is a bulk-count pack rather than a retail card, so it suits an electrical contractor hanging multiple boxes, straps, or supports on hollow wall and ceiling in one run.

The 4 inch length on the J1537 is bolt length, not required wall thickness, so it works on thin drywall as well as thicker assemblies. On 1/2 inch board you will simply have extra thread projecting past the toggle inside the cavity, which is harmless as long as there is clear depth behind the wall. Where the cavity is shallow or packed with insulation or conduit, a shorter toggle avoids the bolt bottoming out before the wings seat.

No. Once the bolt is backed out of a spring wing toggle, the wing assembly drops into the wall cavity and cannot be recovered. Plan on a fresh J1537 for any re-hang, which is one reason the 50 piece jar makes sense for maintenance crews who move fixtures and boxes regularly.

Anything tapped or drilled for 1/4-20 machine thread. The J1537 is a 1/4 inch diameter bolt at 20 threads per inch, so the hole in your strap, box, or bracket needs to clear a 1/4 inch shank, and any nut or coupling you add has to be 1/4-20 as well.