Flat and Circular Anchor Head Wedges for High-Strength Concrete Anchoring

Anchor head wedges are specialized mechanical fasteners designed for permanent, high-strength anchoring into solid concrete. They work on a unique expansion principle: when installed, a sleeve or clip expands outward against the concrete, creating an exceptionally secure, vibration-resistant hold. These components are critical for structural applications where safety and reliability are paramount.

Feature a low-profile, flush base designed for direct contact with flat surfaces such as steel plates, base channels, or brackets. The flat head provides stable, even bearing pressure across the material, preventing tilting or uneven load distribution. This is the standard choice for most general construction fastening tasks.

Characterized by a cylindrical body, often with a locating shoulder or recess. This shape is integral to specialized systems, particularly in post-tensioning and ground anchorage applications for slope stabilization. The circular design allows it to function as an anchor point within multi-strand tensioning systems.

Diameter (ranging from 1/4" to 1-1/4") is dictated by required holding value and fixture hole size. Length is calculated as: Thickness of Material + Minimum Embedment Depth + Space for Nut/Washer.

The absolute minimum depth the anchor must be embedded into concrete to develop holding strength. For example: 1/2" diameter requires 2-1/4 inches; 3/4" diameter requires 3-1/4 inches.

Holding values depend on anchor diameter, embedment depth, and concrete compressive strength (PSI). A universal safety factor of 4:1 (25% of ultimate load) is industry standard.