Concrete Fastening Systems, Inc. can provide the certification required for any particular application if requested at the time of order. The certification can be sent with the shipment or it can be faxed once the order is placed and shipped from our factory. Certification can be provided for American-made wedge anchors as well as for the U.S. steel melted for use in the wedge anchors.
American made wedge anchors should only be used in solid concrete and should not be used in other base materials such as brick or CMU.
The American made Thunderstud is available in nine diameters: 1/4”, 5/16”, 3/8”, 1/2”, 5/8”, 3/4”, 7/8”, 1” and 1-1/4”. The diameter of wedge anchor to choose depends on the weight of the item being fastened, the diameter of the hole in the item and/or if specified by an engineer, manufacturer or the product being attached.
Each diameter comes in a number of different lengths ranging from 1-3/4” long for the 1/4” diameter to 12” long for most diameters over 1/2." Each diameter comes in more than one length and can be manufactured in special lengths as needed for specific job application requirements. Adding the thickness of the material being fastened, plus the minimum embedment of the diameter of wedge anchor being used, plus the thickness of the nut and washer determines the minimum length of wedge anchor.
The Thunderstud American made wedge anchors are manufactured in a number of different types of materials and coatings. Carbon steel wedge anchors are available in either zinc plated or hot-dipped galvanized. The stainless steel wedge anchor comes in 303/304 or 316 stainless steel. The zinc plated wedge anchors should be used in dry indoor applications where moisture is not present. The hot-dipped galvanized wedge anchors can be used in environments in outdoor applications where moisture is present. The 303/304 stainless is used in wet applications. The 316 stainless steel is used in submerged liquid environments that are caustic in nature, such as chlorine.
Each diameter of American made wedge anchors has a minimum embedment for installation in concrete in order to obtain minimum holding values.
A chart can be found at /wedge-anchor-technical-specifications.
The hole should be drilled into the concrete a minimum of 1/2” deeper than the wedge anchor will penetrate the concrete. This allows space for any dust that is created during the installation process to fall, allowing the wedge anchor to be set without bottoming out in the hole.
American made wedge anchors require the hole that is drilled in the concrete to be equal to the diameter of the wedge anchor being installed. If a 5/8” wedge anchor is being used in a specific application, then the diameter of the hole to be drilled in the concrete should be 5/8”. The hole must be drilled by a hammer drill set in the hammer mode and using a carbide tipped bit that meets ANSI standards. Hole tolerance is critical when installing wedge anchors. Therefore, it is important to use a bit that meets ANSI standards for the diameter of wedge anchor being used.
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.