Metallics J1536 Anchors Sprg Wing TogBt 1/4" Trd 20 Lgt 3" (Jar 50)

The J1536 is a spring wing toggle bolt with a 1/4 inch diameter screw, 20 threads per inch, and a 3 inch bolt length. That 1/4-20 thread is the common machine thread size for mounting brackets, strut, boxes and hangers, so it mates with standard 1/4-20 nuts and fittings.

Yes, that is exactly what a spring wing toggle is for: hollow substrates like drywall, plaster, hollow block and hollow ceilings. The wings fold flat to pass through a drilled hole, then spring open behind the wall and spread the load across the back face. The J1536's 3 inch bolt length gives you the reach to clear the wall thickness plus whatever you are fastening, but it also means you need enough open cavity behind the wall for the wings to swing fully open. Solid concrete or filled block is the wrong application, use a sleeve or wedge anchor there instead.

Fifty pieces per jar. The jar pack is the shop-stock format, so it suits an electrical contractor or MRO crib doing repeat hollow-wall and ceiling mounting rather than a single fixture install.

The hole has to be large enough to pass the folded wings, not just the 1/4 inch screw, so a 1/4 inch toggle needs roughly a 3/4 inch hole. Drill the fixture's own mounting hole to the same size or feed the toggle through the fixture before inserting, because the wings cannot be reopened once they are through.

The 3 inch length on the J1536 covers the thickness of what you are hanging plus the wall or ceiling board. On 1/2 or 5/8 inch drywall that leaves plenty of grip length for a strap, box or hanger. If you are stacking a thick fixture base and a double layer of board, measure the total and confirm the screw still threads through the wing with the wings fully behind the substrate, otherwise step up to a longer bolt.

No. Once you back the 1/4-20 screw out of a spring wing toggle, the wing drops into the wall cavity and is gone. Plan on a fresh toggle for every reinstall, which is one reason the J1536 is sold 50 to a jar.