These sleeve anchor bolts represent the most advanced fastening solution available to those who need a permanent and highly reliable anchor bond between structural hardware and solid base materials such as concrete, brick, and/or stone. Manufactured from premium quality carbon steel, they feature a protective zinc finish for maximum protection against corrosion, and were designed to withstand the stresses associated with both commercial construction and large-scale residential renovation projects. They measure 4-1/4 inches in overall length, providing ample embedment depth (a key factor in the achievement of high pull-out resistance) for use in securing objects such as deck railings, equipment, structural brackets and shelving units to masonry surfaces.
The fundamental concept behind the design of the sleeve anchor bolt is based upon the principles of mechanical expansion. Instead of relying upon thread friction (as a standard screw does), the sleeve anchor has a threaded bolt with a flare-cone shaped end that is enclosed within a metal sleeve. Upon tightening the nut against the fixture, the bolt draws upwards and at the same time and the flare-end expands the sleeve outwards toward the sides of the pre drilled hole. In doing so and the sleeve anchor generates a strong 360 degree expansion force around the entire circumference of the bolt. Since the expansion occurs along the full-length of the sleeve and this type of anchor provides superior resistance to displacement in materials having some inherent porosity and/or irregularities due to internal cavities.
Zinc plating applied to these carbon steel anchors acts as an essential sacrificial corrosion barrier against environmental exposure. Carbon steel itself is used because it has superior tensile and shear strengths for use in high-performance applications. However, it is subject to corrosion (oxidation). Zinc plating forms a layer of corrosion resistance that protects carbon steel from degradation in humid indoor or weather protected outdoor locations and thus allowing the integrity of the fastener to remain intact throughout years of service. Consequently and the contractor and DIY inpidual can feel assured that their structural connections will not fail as a result of surface rust or environmental moisture. Additionally, a 4-1/4-inch length provides additional benefits when fastening through heavier materials (such as 2x4 lumber or thick metal plates), yet maintains sufficient length to penetrate deeply into the concrete to achieve a solid "grip".
Installation of these anchors involves several basic steps: however, precision during each step is necessary to maximize load-carrying capability. Installation starts by drilling a hole into the masonry surface using a carbide-tipped masonry bit that matches the size of the outer-diameter of the sleeve. After clearing away all debris and dust from the hole—this is important to allow the sleeve to make direct contact with the masonry—the anchor is then inserted through the structural attachment and down into the hole. A few whacks with a hammer will assure that it sits flush. As the nut is torqued, it will lock into position and create a vibration-resistant, long-lasting structural attachment. This box contains twenty-five anchors making it an optimal number for smaller projects to ensure that you do not have to run back-and-forth to your supplier constantly. Whether you plan to attach a heavy safe to your basement floor or install a ledger board for your new porch, these 4-1/4 inch zinc-coated carbon steel sleeve anchors are designed with professional-quality dependability and durability to meet the requirements needed for successful completion of your project.
[ DISCLOSURE ]
I earn from the qualifying purchases as a Amazon Associate.
