Lag Shield Anchors: The What's And Hows

Lag shield anchors are most commonly referred to as just the lag shield

, lag screw shields, LSES, sup-r-lags or lag screw expansion anchors. These are used for concrete for the light to medium duty anchor they present. You've got two kinds of sup-r-lags to work with, a short lag and a long lag. You can be sure that fixtures and brackets attached with the use of these lag screw shields are attached securely to bricks, block materials and concrete. Using a unique four way expansion, the anchor ensures that a tight grip is maintained in the base materials. When you look at lag shields, they're basically two-part expansion shields. They're pre-assembled into one self contained unit.

Tapered internal threads line the shell like unit. On the anchor itself, there are circumferential ribs that run from the bottom that goes on to a certain length. While on the back end of the anchor, you have two equally spaced ribs. They go beyond the diameter of the anchor and this also runs up to a certain part of the anchor's length. When installing lag anchors, ones with precision internal threads allow the screw to be turned even without lubrication. Upon fastening to concrete, it becomes easy to remove and unbolt objects from it. Mainly, these anchors are made up of a rustproof material called Zamak 5. If you're going to use these LSESs in building, you're going to need a few tools like a hammer, hammer drill, masonry drill bit, anchor setting tool, shop vacuum, round wire brush, masking tape and of course your safety glass and ear protection.

First, you have to set depth of the hammer drill when you want to fasten anchors. You then insert the proper masonry bit. The bit has to be exactly the same size as the lag shield anchor you're installing. Next, you start drilling the hole. Put your drill in hammer mode and start drilling until you reach the masking tape mark you put or until you've reached the base of the drill bit. Clean the drill hole out of debris with the shop vacuum. You then insert your anchors and make sure they're secure by tapping them into place with a hammer. You now have to affix the fixture and secure it with a threaded bolt. For example, you're putting in a bracket over your lag shield anchors. You only have to insert the machine threaded bolt, turn it clockwise and tighten it with a wrench. As you're tightening the threaded bolt, the anchors will be doing their job with expanding in the hole creating a strong anchor for your bracket.

Remember though that when you tighten the threaded bolt in the last stage of installing lag shields, don't apply too much torque. It can be easily damaged if it's fixed on the concrete too tightly. When you want a secure place for your fixtures or brackets, you've got lag shield anchors doing the work for you.

by: Gary Hall

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