Metallics 3726F Anchor 3/8 x 2-3/4 FH Slv Ancr St-Zn (100 pcs)

A sleeve anchor is drilled at the same nominal diameter as the anchor, so the 3/8 inch 3726F takes a 3/8 inch carbide bit in concrete, block or brick. The sleeve expands against the hole wall as the nut draws the cone up, which is why the hole diameter has to match rather than be oversized.

Yes. The 3726F is a flat head (FH) sleeve anchor, meant to sit flush in a countersunk hole in the fixture rather than stand proud like an acorn or hex head. Pick it where you need a flush surface, for example under a plate, a door threshold, or a strut base someone will walk over. If the fixture hole is not countersunk, a hex head sleeve anchor is the better choice.

These are zinc plated steel, which is a coating for dry indoor or protected service. Zinc plating gives limited corrosion protection and is not a substitute for hot dip galvanizing or stainless in wet, coastal, or chemically exposed locations. For interior concrete, block walls, and mechanical rooms it is the normal spec.

Sleeve anchors like the 3726F are for solid base material, concrete, solid brick, or the solid web of masonry. In a hollow block cell or in drywall there is nothing for the sleeve to expand against, so you want a toggle or a hollow wall anchor instead. If you are hitting a hollow block face shell, relocate the hole into the mortar joint or the solid web.

It comes 100 pieces per box under part number 3726F. For electrical contractors setting strut, panel backboards, or conduit standoffs, that box quantity is sized for a full run rather than a single fixture.