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:
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:
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.
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.
Each diameter of sleeve anchor requires a minimum embedment depth into the block in order for the sleeve anchor to achieve minimum holding strength:
*Minimum embedment is less for anchors shorter than standard minimum embedment depth.
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.
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.
As 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.