Choosing best fasteners for hollow and solid masonry

A masonry anchor's holding values is directly related to the quality and type of base material that will be present in the application. The type of masonry will determine the specific masonry anchor needed for an application because the anchor will expand differently in these various masonry materials: · concrete · block · brick · grout-filled block and mortar

A masonry anchor's holding values is directly related to the quality and type of base material that will be present in the application. The type of masonry will determine the specific masonry anchor needed for an application because the anchor will expand differently in these various masonry materials:

· concrete
· block
· brick
· grout-filled block and mortar

An important consideration for selecting a masonry anchor is whether the working end of the fasteners will be in solid base material, such as concrete, mortar, grout filled block, or will be in hollow block or brick. To acquire versatility on the job site, mechanical anchors that accommodate both hollow and solid masonry may represent an optimal choice.

Mechanical expansion anchors work by creating an outward force against the inside walls of the hole in the masonry material. The anchor creates an outward force when it mechanically changes its form as it is inserted into the hole and then expanded. This action creates the outward force that produces the friction to provide the holding values.

Headed Type Anchors for Hollow and Solid Masonry
Tapcon
· tap threads into a predrilled hole in the masonry
· available in both a hex washer head and flat countersunk
· manufactured in different lengths to accommodate various thicknessed of the material being fastened

Sleeve Anchors
diameter of the anchor is equal to the diameter of the hole that needs to be drilled in the masonry
manufactured in six diameters and four head styles: acorn, hex, flat or round

Hammer Drive
· light duty fastener that utilizes a nail to expand anchor once the anchor has been inserted into the hole in the masonry
· anchor body is made from a zamac material with a large mushroom head to provide a bearing surface against the item being fastened I
· considered a permanent fastener because there is not a way to back out the nail once set
Split Drive
· one piece with either a flat countersunk or round head
· available in ¼" diameter for light duty fastening
· set in the masonry by inserting it in the hole and striking the head until the head is flush with the surface of the item being attached
· cannot be removed after it is installed

Flush Type Anchors for Hollow and Solid Masonry

Machine Screw Anchor
internally threaded fastener requires the use of a setting tool and the bottom of the hole
light to medium duty fasteners
national coarse threads
can be used with a bolt or threaded rod.

Single Expansion
provides excellent holding values
mostly used in the hard dense material
internal threads are all national course
light to medium duty fastener

Double Expansion
· perfect for applications where the base material is suspect in its ability to provide adequate holding strength
· expands along its entire length to provide holding values even in the softest or inadequate base materials

Lag Shield comes in both a short or long version for each diameter: short version is for harder denser base materials and long version is usually used in softer masonry base materials requires the use of a lag screw for a proper set

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