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Block Anchor

Friday, September 16, 2011
Customer Reviews


Purchase Sleeve Anchors

The most versatile block anchor with the most consistent holding values is the sleeve anchor. Sleeve Anchors have many features and benefits that make them the best choice for fastening as a block anchor. Sleeve anchors can be used in indoor or outdoor applications because they are both available in both zinc plated carbon steel and 304 stainless steel. The wide range of diameters, lengths, and head styles allow for a wide range of different applications.


Each diameter of sleeve anchor comes in a number of different lengths to accommodate different thicknesses of materials being fastened and embedment depths.


The sleeve anchor comes in six different diameters ranging from 1/4” to 3/4”. See diameter and length chart below:

Diameter and Length Chart

Acorn and Hex Head

1/4” 5/8”
5/16” 1-1/2”
3/8” 1-7/8”
1/2” 2-1/4”
5/8” 2-1/4”
3/4” 2-1/2”

Round Head

1/4” 1-1/4”

Flat Head

1/4” 2”
5/16” 2-1/2”
3/8” 4”

Head Style

Each diameter of sleeve anchor is available in different head styles, but not all diameters come in all head styles. Each diameter is listed below with the head style(s) that are available:

1/4” X   X X
5/16”   X    
3/8”   X X  
1/2”   X    
5/8”   X    
3/4”   X    

Hole Diameter

The hole in the block that needs to be drilled before inserting the sleeve anchor is equal to the diameter of the sleeve anchor used; a 3/8” sleeve anchor requires a 3/8” hole to be drilled into the block.

Hole Depth

The depth of the hole in the block must be drilled a minimum of 1/2” deeper than the sleeve anchor will penetrate the block.

Minimum Embedment

Each diameter of sleeve anchor requires a minimum embedment depth into the block in order for the sleeve anchor to achieve minimum holding strength:

DiameterMinimum Embedment
1/4” 1-1/8”
5/16” 1-1/4”
3/8” 1-1/2”
1/2” 1-7/8”
5/8” 2”
3/4” 2-1/4”

*Minimum embedment is less for anchors shorter than standard minimum embedment depth.

Drilling Hole

The hole in the block must be drilled using a hammer drill with the hammer drill set in the hammer and rotation mode. A carbide tipped must be used and the bit must meet ANSI standards to ensure that the required hole tolerance for the diameter of sleeve anchor being installed is achieved.

Anchor Placement

The sleeve anchor can be placed on any part of the block, including the mortar joints. The holding values will differ depending on the position of the sleeve anchor on the block. Each block is different and the holding values will differ accordingly. The holding value of a sleeve anchor placed in a mortar joint will depend on the quality of the mortar as well as the quantity of mortar in the joint. A sleeve anchor placed in the hollow section of the block will differ in its holding value from block to block as well as from a sleeve anchor placed in the solid section of the block. The sleeve anchors’ holding values are totally dependent on the strength of the block base material that they are installed in.


  1. Drill hole in the block using the correct diameter ANSI standard carbide bit and using a hammer drill set in the hammer and rotation mode.
  2. Drill the hole to a minimum of 1/2” deeper than the sleeve anchor will penetrate, making sure the sleeve anchor is installed at minimum embedment depth for the diameter of sleeve anchor being installed.
  3. Clean the hole of all dust and debris using a wire brush, compressed air or vacuum.
  4. Insert the sleeve anchor through the fixture being fastened and into the hole in the block until the washer is flush with the surface of the fixture.
  5. Using a wrench for the hex and acorn head, or a slotted or phillips driver for the flat-headed sleeve anchor, turn clockwise 3 to 4 turns.

You can take a look at our sleeve anchors by following this link.

Purchase Sleeve Anchors


Always use personal protective equipmentAs with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.

Article Written By:
Mike Pistorino, Vice-President Operations





Concrete Fastening Systems, Inc. has over 40 years of experience selling concrete fasteners. We can ship out one box or a whole pallet of concrete anchors. Our products are of the highest quality... "your satisfaction is guaranteed". We ship all orders the same day the order is received.

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