There are 2 kinds of expansion anchors, single expansion anchors and double expansion anchors. Expansion anchors are used in soft masonry and materials of questionable, like brick or stone. Made of a zinc alloy, expansion anchors are rustproof. The screw or bolt can be removed from the anchor if necessary and replaced while maintaining holding power. Double expansion anchors have 2 ends that, when expanded, hold in place using the full length of the anchor body.
- Using a masonry bit with a diameter which equals the anchor diameter and meets ANSI SPECIFICATION B212.15-1994, drill a hole slightly deeper than the anchor length.
- Clean hole thoroughly of debris using compressed air or a blow out bulb.
- Insert the expansion anchor into the hole, nut end first, and hammer the anchor down untilit is flush with or slightly above the surface plane of the concrete.
- Insert bolt through fixture, and tighten until anchor is set. The bolt should be the same length as the anchor plus the thickness of the material being fastened.