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Hilti Wedge Anchors

Thursday, December 8, 2011
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The Hilti wedge anchor, called the Kwik-Bolt, also has a number of other related products called the Kwik-Bolt 3 as well as the...

The Kwik- Bolt 3 has a number of features and benefits. One convenient feature is the end of the Kwik-Bolt 3, which can be inserted into the hole first because it is rounded to allow for easy installation.  The threaded end is dog pointed to help prevent thread damage during installation.  The Kwik-Bolt 3 comes with standard threads for applications where the higher shear value is required and longer threads where installation flexibility is required.   The Kwik-Bolt 3 is available in zinc plated carbon steel, hot-dipped galvanized, 304 stainless steel and 316 stainless steel for applications in different environments.

Variations and Their Functions

Both the Kwik-Bolt 3 and the Kwik-Bolt TZ are designed for use in solid concrete and give a consistent performance for a wide range of mechanical anchor applications such as handrails, storage racks, pipe supports, and guardrails.  The zinc plated carbon steel Kwik-Bolt is used in dry indoor applications whereas the hot-dipped galvanized is used in an outdoor application where moisture may be present.  The 304 is used for wet environments and the 316 is used for submerged environments where some chemicals may be present.

The zinc plated carbon steel Kwik-Bolts in both the standard threaded and the long threads come in six different diameters: 1/4”, 3/8”, 1/2”, 5/8”, 3/4” and 1”.  The hot-dipped galvanized Kwik-Bolt 3 comes in only three diameters of 1/2”, 5/8” and 3/4”. Both the standard thread and long threaded 304 stainless steel Kwik-Bolts come in six diameters of 1/4”, 3/8”, 1/2”, 5/8”, 3/4” and 1”.  The 316 stainless steel Kwik-Bolt comes in standard threads in diameters of 1/4”, 3/8”, 1/2”, 5/8”, 3/4” and 1”. There are two other special Kwik-Bolt 3 types that are designed for special applications and do not come with a nut and washer.  The rod hanger Kwik-Bolt 3 is 3/8” x 2-1/4” with a 3/8” rod coupler for hanging threaded rod from ceiling applications and is zinc plated carbon steel.  A flat head countersunk post headed Kwik-Bolt 3 is available in two diameters of 1/4” and 3/8” and comes in the zinc plated carbon steel or stainless steel.

Each diameter of Hilti Kwik-Bolt comes in different lengths, and the lengths are different for each diameter.  The minimum length of Kwik-Bolt 3 to use for any particular is determined by adding the thickness of the material to be fastened to the minimum embedment for the diameter of the anchor being used, plus space for the nut and washer.  The diameter to use for any particular application is determined by a number of different factors.  First, the weight of the object being fastened is the first consideration. The heavier the object being fastened then the larger the diameter of wedge anchor that should be used.  Secondly, the hole in the object that is being fastened must be considered since the Kwik-Bolt must be small enough to fit through the hole. Finally, depending on the application and engineer, there may be a specified diameter and length of Kwik-Bolt to be used in specific applications. If this is the case, then what the engineer has specified should be used.

When installing the Kwik-Bolt 3, a hole must be drilled into the concrete. The diameter of the hole is equal to the diameter of the anchor.  The hole must be drilled using a hammer drill that is set in the hammer and rotation mode and using a carbide tipped bit that meets ANSI standards.  The tolerance between the hole diameter and anchor diameter is critical; using an ANSI standard bit ensures the hole size. After the hole is drilled, it is important that the hole is cleaned out using a wire brush, vacuum or compressed air. The depth of the hole should be a minimum of 1/2” deeper than the Kwik-Bolt 3 would penetrate the concrete.  This extra space at the bottom of the hole allows room for any dust and debris to fall into during the installation process.   The Kwik-Bolt 3 does not use the bottom of the hole to be set, so the hole can be any depth as long as it is deep enough to ensure that the anchor is embedded after expansion to minimum embedment depth for the diameter being installed.

All wedge anchors work on the same principles and are made from essentially the same material; the biggest difference is the style of the expansion clip.  The Hilti Kwik-Bolt is manufactured by Hilti.  Concrete Fastening Systems, Inc stocks a complete line of American made wedge anchors that include the zinc plated carbon steel, hot-dipped galvanized, and stainless steel.

Wedge Anchors

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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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