Double Expansion Shields are a corrosion resistant anchor that is designed to be used with a machine bolt in concrete, brick, block, and stone. The anchor comes pre-assembled and consists of a zamac alloy anchor body, two expansion cones (one at each end of the anchor), and a wire expanding ring that holds the entire anchor together. The expansion cones are drawn in at each end of the anchor as the machine bolt is tightened into the
anchor – ensuring consistent and even expansion along the entire anchor body. Recommended for anchoring into base materials of questionable strength.
Drill Bit Dia. (in.): 5/8
Thread Size (UNC): 5/16 - 18
- Normal Weight Concrete
- May be suitable for Lightweight Concrete
- Zamac Alloy