Zamak Zinc Alloy Double Expansion Shield Anchors

Double Expansion Masonry Anchors

Zamak Zinc Alloy Concrete Anchors for Masonry Screws or Bolts

  • Zamak Zinc Alloy
  • Four Part design: a two-piece tubular shield, a hollow, wedge-shaped cone and a wedge-shaped nut-- brought together into a single anchor unit
  • Used in soft masonry with machine screws or machine bolts
  • Can also be used in harder materials, including stone, brick, concrete or block
  • Expansion of the band or shield occurs during installation
  • For applications that deal in shear loads or where the bolts are subjected to pressure or vibration

A Double Expansion Shield Anchor is suited to anchor into materials of questionable strength such as materials that may be soft or of low quality. This is due to the design of the double expansion anchor as it expands upon its entire length, maximizing friction and holding power even in low quality or suspect materials. Can be used in brick, block, and stone as well.

Thread Size: Recommended Hole Diameter: Minimum Diameter of Shield Body: Minimum Length of Shield Body: Proof Test Load
(Ultimate Tensile Strength in 3000 psi. strength concrete)
1/4"-20 1/2" 1/2" 1-5/16" 1100
5/16"-18 5/8" 9/16" 1-5/8" 1450
3/8"-16 3/4" 1/16" 2" 1750
1/2"-13 7/8" 7/8" 2-1/4" 2200
5/8"-11 1" 1" 2-3/4" 3250
3/4"-10 1-1/4" 1-1/8" 3-1/4" 4600
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Product Specifications
Corrosion Resistant
Zamak Zinc Alloy
System of Measurement (Unit)
Thread Direction
Right Hand
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances