Yellow Zinc Alloy double expansion shield anchor made in china

Double expansion anchors are designed for anchoring into concrete, brick or block base material. 

Inserting a machine-treaded bolt into the anchor expands the Double Expansion Anchor against the concrete at two points. 

It is made from Zamak, a non-rusting material, and is available in diameters ranging from 1/4" to 3/4". 

The double expansion anchor is set flush with the base material and is considered a light to medium-duty fastener. 

Double expansion allows for better holding values.

Concrete

Block

Brick

Stone Base Materials

1. Using a hammer drill and a carbide tipped masonry bit, drill a hole of recommended diameter (see chart below) into the base material to a depth equal to, or slightly deeper than, the length of the expansion shield.

2. Clear the hole of all debris.

3. Place the Double Expansion anchor, nut end first, into the hole. The top end of the anchor should be flush or slightly below the base material surface.

4. Place the object to be fastened over the anchor in the base material and bolt in to place. The bolt should sufficiently engage the threads of the anchor.