Metallics LCS3816 Anchors 3/8 X 1-3/4 Hx Lg-Dia Conc Scr St-zn (Jar 50)

Fifty anchors per jar. The pack type is a jar, which is the typical quantity an electrical contractor pulls for strut, conduit hanger, and junction box mounting on concrete.

Yes. The LCS3816 is a screw anchor: drill the hole, blow it out, and drive the screw into the concrete with an impact driver on the hex head. There is no sleeve to expand and no need to torque against a nut, which is why these are commonly used in place of wedge anchors where the fixture may have to come back off.

The LCS3816 is steel with zinc plating, which is a dry interior finish. For exterior slabs, parking structures, wet mechanical rooms, or coastal exposure, specify a stainless or mechanically galvanized concrete screw instead of zinc plated steel.

Large-diameter concrete screws are driven into a hole matched to the screw's nominal callout, so a 3/8 inch screw like the LCS3816 goes into the carbide bit size the manufacturer specifies for that diameter, drilled deeper than the 1-3/4 inch anchor length to leave room for dust. Match the bit to the printed instruction on the jar rather than assuming the bit equals the thread diameter.

These are specified as concrete screws, so poured concrete is the base material they are built for. In hollow block or brick, a screw anchor of this diameter relies on the thickness and condition of the web, which varies by unit, so a sleeve or toggle type anchor is the safer choice in hollow masonry.