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Double Expansion Masonry Anchors
Zamac Zinc Alloy
Double Expansion Masonry Anchors are made of Zamac Zinc Alloy, a metal made of Zinc, Aluminum, Magnesium and Copper. Zamac Zinc alloy is designed to be durable and retain its strength and hardness over time.
Double Expansion Design
Double Expansion Anchors feature a 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.
Safe for Soft Materials
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 (rather than just the bottom), maximizing friction and holding power even in low quality or suspect materials. Can be used in brick, block, and stone as well.
James Childs
Reviewed in the United States on November 3, 2023
Work well to hold items on foundation
Thumbs
Reviewed in the United States on January 12, 2023
First, they are expensive. But I needed something to anchor into brick. These are so poorly made they fall apart in your hand. The photo shows one that I handled to look it over. Next thing I knew, it broke apart in my hand. I Tried threading a bolt in a different one and the threads are so poorly cut that the bolt wouldn't go in without undue force. They are junk. I'm not going to even try to use them. I'd send them back if not for the outrageous restocking fee and shipping costs, and the gas used to get to the post office.
Anne
Reviewed in the United States on July 2, 2022
Perfect for my project
John B.
Reviewed in the United States on December 22, 2022
These were expensive and very difficult to install and get to work properly. First, the parts of the anchor were not attached and some times fell apart. When, that happened, I had to try to find the piece that had fallen on the ground. Second, the expansion of the anchor is much less than the typical led anchor that uses a lag screw. Because of this, if the hole in the masonry is slightly oversized, this anchor will not work. I used a hammer drill with a brand new 1/2 inch Milwaukee hammer drill bit. Two of the 8 holes I drilled were oversized and would not work. Because of the design of the anchor, I could not use epoxy to accommodate the oversize hole. Third, the machine threads in the anchor are made out of lead, not steel. Therefore, I suspect the limiting factor in pull out resistance is the shallow machine threads in the lead anchor. I suspect, the deep threads in a traditional lead anchor will have much greater resistance to pull out. Finally, the instructions tell you to blow out the dust before inserting the anchor. That might be fine for solid concrete, but it is not OK for bricks which have holes in them filled with mortar. The drill made dust out of the red brick, but it made chunks out of the mortar. You can't blow the mortar chunks out with compressed air. If you don't get the chunks out the anchor not go in the hole as it should. Therefore, you have to use a tweezer to remove the chunks. In short, I spent hours using these fasteners when I could have done the job in minutes with the older style lead anchors and lag screws and at a much less cost.
Chris L.
Reviewed in the United States on November 22, 2022
Fastened posts to brick stairs. They worked great and didn't crack the brick like other anchors would.
kyale jamison
Reviewed in the United States on April 21, 2022
The inside of the anchors had casting imperfections that made it hard to thread screws through properly
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