A flat headed sleeve anchor is a special type of masonry fastener made up of four parts: an internal stud that is flared outwardly and cone shaped on one end with the other end threaded, a sleeve that fits over the internal stud, and a flat countersunk head that threads onto the stud. All parts of the flat-headed sleeve anchor are zinc plated and are packaged assembled.
The flat-headed sleeve anchor is an expansion-type anchor that works by turning the flat head clockwise, which pulls the cone shaped internally threaded stud upwards and expanding the sleeve against the walls of the hole in the base material.
The flat-headed sleeve anchor is one of the most versatile types masonry fasteners due to its use in most base materials. Because of the wide range of expansion, the flat-headed sleeve anchor works well in dense solid concrete to light hollow block as well as in solid brick and hollow brick.
The flat-headed sleeve anchor is available in three diameters of 1/4”, 5/16 and 3/8” with each diameter manufactured in different lengths. Both the 1/4” and 5/16” come with a slotted head, and the 3/8” comes in a flat phillips head. The slotted head is designed for use with a slotted screwdriver and the phillips head is designed for use with a phillips drive screwdriver. The first number in the description refers to the diameter and the second number refers to the length of the flat-headed sleeve anchor. All flat headed sleeve anchor lengths are measured as an overall length which includes the head.
|Description||Part Number||Type of Drive|
|1/4” x 1-3/8”||SAF14138||Slotted|
|1/4” x 2”||SAF142||Slotted|
|1/4” x 3”||SAF143||Slotted|
|1/4” x 4”||SAF144||Slotted|
|5/16” x 2-1/2”||SAF516212||Slotted|
|5/16” x 3-1/2”||SAF516312||Slotted|
|3/8” x 4”||SAF384||Phillips|
|3/8” x 5”||SAF385||Phillips|
|3/8” x 5”||SAF386||Phillips|
The heads of flat-headed sleeve anchors are designed to be countersunk into the material that is being fastened down. Once installed, the head is flush with the surface of the fixture.
The flat-headed sleeve anchor is used in light to medium duty fastening; such as door frames to block walls or stair treads to concrete steps. All applications require that the head of the flat-headed sleeve anchor fits flush with the surface of the material being fastened.
The diameter of the hole that is required to be drilled in the base material is dependent upon the diameter of flat-headed sleeve anchor being installed. The hole diameter is equal to the diameter of the flat headed sleeve anchor, i.e. a 1/4” flat headed sleeve anchor requires a 1/4” hole, a 5/16” requires a 5/16” hole and the 3/8” requires a 3/8” hole. The hole must be drilled using a hammer drill with the hammer drill set in the hammer and rotation mode. Carbide tipped masonry bit must be used in the hammer drill and the bit must meet ANSI standards. Hole tolerance is critical when installing flat-headed sleeve anchors; using an ANSI standard bit ensures matched tolerance between the hole diameter and the anchor diameter.
The minimum length for a flat-headed sleeve anchor to use is determined by adding the minimum embedment for the diameter of flat-headed sleeve anchor plus the thickness of the material being fastened. This will provide the minimum length of flat-headed sleeve anchor to use for any particular application.
Each diameter has a different minimum depth of embedment for the flat-headed sleeve anchor to obtain minimum holding values.
Each flat-headed sleeve anchor must be installed both a minimum distance from each other and a minimum distance from an unsupported edge. The rule of thumb for the concrete fasteners is to install them 10 anchor diameters away from each other and 5 anchor diameters from an unsupported edge.
|Sleeve Anchor Diameter||Spacing|
|Sleeve Anchor Diameter||Edge Distance|
The diameter of the hole in the fixture must be slightly larger than the designated diameter of the flat-headed sleeve anchor being installed.
|Sleeve Anchor Diameter||Hole Diameter in Fixture|
|1/4”||1-1/8”||5 ft/lbs||875 lbs.||1,430 lbs.|
|5/16”||1-7/16”||8 ft/lbs||1,110 lbs.||2,145 lbs.|
|3/8”||1-1/2”||15 ft/lbs||1,590 lbs.||3,060 lbs.|
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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.