Concrete and Masonry

DUCs are mechanical anchors expanded into holes that have been undercut at the bottom using an undercutting drill bit. This creates a true bearing type anchor that performs like a cast-in-place headed anchor. Load is transferred into the concrete through bearing, not friction like traditional expansion anchors. Excellent performance in seismic and dynamic loading conditions. Meets ACI 318-14 Chapter 17 (2018 IBC) requirements as a code anchor, including seismic loading, tension zone, and cracked concrete provisions.

DUC Undercut Anchor Advantages vs. Heavy Duty Sleeve and Expansion Anchors and other undercut systems:

• DUC Undercut design provides consistent expansion and is easy to set. Stress risers have been eliminated to prevent tearing.
• Large bearing area provides exceptional performance even in lower strength concrete.
• Load transfers mainly through bearing, not expansion forces and is not dependent upon friction which can be lost when cracks occur.
• Thick walled sleeves transfer load over a larger area which insures predictable ductile performance.
• ASTM A36 or A193 grade B7 rods are used. Full ultimate steel strength of the threaded stud is developed at listed embedment and spacing. Stainless steel is also available.
• Installation is simple. It is similar to installing a typical expansion anchor; no coring drills are necessary. Creation of proper undercut is correctly done and easily verified using DUC Undercut Bits. Creation of undercut takes only seconds.