Metallics JTA38412 Anchors 3/8 X 4-1/2 Hllw Block T-Ancr (Jar 25)

The JTA38412 is a 3/8 x 4-1/2 inch hollow block toggle anchor, packed 25 to a jar. The 3/8 refers to the bolt diameter and 4-1/2 inches is the bolt length, so you get enough reach to pass through a hollow block web or wall board and let the toggle wings open behind it.

That is exactly what the Metallics JTA38412 is built for. It's a hollow block toggle anchor, so it's meant for block, masonry and other hollow-cavity substrates where there is open space behind the face for the toggle to spring open. In solid concrete or solid brick there is no cavity for the wings, so a sleeve, wedge or screw anchor is the right choice there instead.

The bolt itself is 3/8 inch, but a toggle anchor needs a hole big enough to pass the folded wings through, not just the bolt, so the drilled hole is larger than 3/8 inch. Follow the hole size printed on the Metallics jar label for this anchor. The 4-1/2 inch length is the usable bolt length through the fixture and the block face.

Yes, this is an electrical-trade fastener, catalogued by Metallics for electrical supply work, and 3/8 inch toggles are the common size for hanging unistrut, conduit clamps, cable tray drops and junction boxes off hollow block or hollow walls. The 25-count jar suits a van or shop stock for repeat support work.

With a 4-1/2 inch bolt, the grip range is whatever is left after the toggle clears the back of the block web, so it covers thick block faces plus the fixture you are bolting through. If you are only fastening to a thin drywall partition, a shorter 3/8 toggle will set more easily; the extra length on the JTA38412 is there for the deeper sections you hit in block construction.

Order by Metallics MPN JTA38412. That one number covers the 3/8 x 4-1/2 hollow block toggle anchor in the 25-piece jar; there is a single configuration, so there is no finish or length option to specify.