Shop All Concrete Wedge Anchors
Concrete Wedge Anchors are used to anchor and secure materials and equipment to solid concrete masonry surfaces. Concrete Wedge Anchor Bolts have a mechanism on near the bottom that expands once installed and "wedges" itself into the concrete.
Wedge Anchors are installed into drilled holes, exclusively in concrete. The non-threaded end is embedded into the hole and then struck to activate the expansion mechanism, which is fully utilized as the nut is tightened over the washer on the outside of the surface, on the material being fastened. The majority of the wedge anchor remains embedded in the solid masonry material being fastened to.
*Note: Wedge Anchors are considered a permanent installation. The material or equipment may be removed but the fastener cannot be removed from the concrete. The only way to remove a wedge anchor is to cut through it flush to the ground.
Wedge Anchors are commonly used on oil rigs, docks, piers, floors, walls or slabs. They are available in Zinc Plated Steel, Hot Dip Galvanized Coating and both 304 and 316 Stainless Steel grades. Wedge Anchors are available in 1/4"-20, 3/8"-16, 1/2"-13, 5/8"-11 and 3/4"-10, 7/8"-9 and 1"-8 sizes, with the nut and washer included.
Minimum Embedment Depth For Wedge Anchors
|Minimum Embedment Depth||1-1/8"||1-1/8"||1-1/2"||2-1/4"||2-3/4"||3-1/4"||3-7/8"||4-1/2"||5-1/2"|
Wedge Anchor Installation Instructions
Drill A Hole Into Concrete and Insert The Wedge Anchor - The first step is to insert the wedge anchor into a pre-drilled hole (or drill the hole into the masonry material with a masonry drill bit). Make sure the hole is clear of debris. The hole should be the same diameter as the wedge anchor. The nut and washer should be removed before installation. The anchor should fit snuggly into the hole. Hit the top of the anchor with a hammer (on the unthreaded portion) until the desired embedment depth is reached.
Add the Material - The next step is to add the equipment or material being anchored to the concrete over the exposed threaded portion of the wedge anchor. Double check prior to installing the material that the anchor has reached at least the minimum embeddment length. Next add the washer and then the nut.
Tighten the Nut - This is the important part. Using a wrench or socket, tighten the nut. This pulls the threaded portion of the bolt up through the wedge mechanism at the bottom of the anchor, which expands and embeds into the concrete and anchors the material to the concrete.
Finished Application - After the nut is tightened and the wedge has embedded into the masonry surface, the material you are anchoring should have a tight fit and be resistant to pulling out of the initial hole. Wedge anchors provide one of the strongest holds of all masonry anchors and are used in a wide variety of applications.
How to Install Wedge Anchor Bolts
Wedge Anchor Installation Transcript
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Bob: Welcome back to Albany County Fasteners - Fasteners 101. Today we're going to be reviewing Wedge Anchors, so let's get started.
Zinc plated wedge anchors are used in interior applications and can be used on exterior applications. Hot dip galvanized wedge anchors are used for exterior applications. In fresh water, such as rain water, bay water, anything where you are using it in a non-salt water application. 304 Stainless is also used in fresh water. This will give you long lasting non-corrosive applications. So you would use stainless steel in an application where, you do not want to see any rust over a period of time or any surface corrosion.
316, 316 stainless is marked as 316. You'll find it marked on the nut. 316 Stainless. You'll find it on the washer, marked, as 316 stainless. And you'll see a marking on the bottom of a 316 stainless wedge anchor These wedge anchors can be used in saltwater applications. Such as docks, decks, anywhere you have, or a boardwalk; Anywhere you have a application where you are using salt water.
Okay, so we're going to prepare to install this half inch wedge anchor. We're going to take the nut off and the washer; we're going to use this blue tape as a marker to prevent from drilling through the concrete. I'm drilling into 8 into the concrete here so I have no worries, this is a two and three-quarter inch wedge anchor, so I have no worries about drilling through the concrete you never want to drill through the concrete so the bottom of the wedge anchor goes through the concrete. You always want to make sure you have enough thickness in concrete for the correct length of wedge anchor.
You want to have at least one inch sticking out of the top of the concrete, when you finish, so I'm going to take the wedge anchor and just put it up here and go to optimally 1 inch below and I'm going to put the tape where I want to stop from drilling. Stop the drill from continuing to drill it through the concrete if you drill the hole too deep it's not really going to hurt it if you were a little further let's say another half inch you just don't bang the wedge anchor too far down because once you push it down you will not, this piece down here creates the wedge once you put the wedge anchor into the hole and you pull up on it then wedges into the concrete preventing you from pulling the anchor out.
At that point you would have to use a Sawzall and cut it off to make it even with the concrete and then fill the hole push it down and fill the hole if you, you know, want to close up the hole. So now we're prepared and ready to drill a hole in the concrete and install the wedge anchor.
You just want to, tighten it to where it snugs up very tight. There you go, it is now that post base is now installed. Put the cover over it, put your post in, your deck is ready to go in place.
There you go, we've reviewed the proper installation for a wedge anchor. Along with proper materials to be used for your application.
Not sure what material you need? Check out our Material Guide to find the right material for your needs!