A drop in anchor is female anchor which is designed to be used in concrete and create a very strong point for attaching a bracket, post or other fixture to a cement slab. Drop-in anchors are very strong and can be used to secure very heavy items to the slab. Some types of anchors can be installed in concrete walls; however, this how-to guide will teach you how to install a drop in anchor in a concrete slab or foundation.
Step 1 - Adjust Depth on Hammer Drill
Before you get started, you should adjust the depth of the drill bit on the hammer drill. If you're hammer drill does not have a depth adjustment, you can place a piece of masking tape at the point where you'll need to stop drilling.
Step 2 - Set Hammer Drill to Hammer Mode
Once you have adjusted the depth of the hammer drill, said the drill to hammer mode.
Step 3 - Select Correct Drill Bit Size
When installing a drop in anchor, it is very important that you choose the correct size of masonry drill bit. For instance, a 1/4 inch drop in anchor requires a whole that is about 3/8 inch in diameter. As a general rule of thumb, if you make the hole about 1/8 or 1/16 inch larger than the diameter of the drop in anchor, it should fit properly.
Step 4 - Drill the Hole
Place the hammer drill perpendicular to the point where you want to drill the hole. Then, drill the hole to the desired depth and withdraw the hammer drill.
Step 4 - Vacuum Out Dust and Debris
Use a shop vac to vacuum out all concrete dust and debris that remains in the hole. You can also use a round wire brush to help loosen debris inside the hole as well. In order for a drop in anchor to fit properly, it is very important that you remove as much concrete dust and debris as possible.
Step 5 - Insert Drop in Anchor
Insert the drop in anchor into the hole. If you have a problem getting the drop in anchor to go into the hole, remove it and vacuum the hole again. Make sure the top of the drop in anchor is flush with the top of the slab.
Step 6 - Set the Drop in Anchor
Once you drop the anchor into the hole, insert the setting tool into the hole on top of the anchor. Then, strike the setting tool with a hammer until the lip of the setting tool comes in contact with the lip of the drop in anchor. This will ensure that the drop in anchor is properly set into the cement slab.
Step 7 - Attach Fixture and Threaded Bolt
After you've inserted the drop in anchor, you can attach your fixture or a bracket to be secured to the cement slab. Thread the threaded bolt into the drop in anchor and tighten with a wrench.