Step 1
Determine what size expansion bolt is required for your application. A common installation of securing the metal legs of a machine to a concrete floor, for example, might require one expansion bolt per leg, with each expansion bolt 3/8 inch wide by 3 inches long.

Step 2
Mark the location of the expansion bolt locations on the floor--this is where the bolt will be secured to the floor. Most heavy duty machines have holes pre-drilled in their feet (legs) for just this purpose. Mark the location of all anchors on the concrete at one time with a marker, so that they are all aligned correctly relative to one another.

Step 3
Drill the proper size and depth hole for each anchor. The correct size of hole will be supplied by the manufacturer of the anchor bolt, usually labeled right on the box. A rule of thumb is that for a 1/4 inch anchor, use a 1/2 inch drill bit; for a 3/8 inch anchor, use a 5/8 inch drill bit, etc. Depth of the hole is determined by making sure the nut can attach to the bolt (anchor) with enough threading remaining so that it can be torqued sufficiently (usually two complete 360 degree turns of the nut).

Step 4
Insert the anchor into the hole. Make sure the anchor is resting at the very bottom of the pre-drilled hole before proceeding. Gently tap the anchor (using a hammer) until you are sure it is in its proper position. Remove the nut from the anchor. Next, insert the anchor tool onto the top of the buried anchor (the tool will be included with the anchor(s) kit). Strike the anchor tool firmly three or four times, which will expand the anchor sleeve enough to allow the expansion process to begin once the nut is tightened.

Step 5
Insert the bolt through the device being secured and then into the anchor (which is still buried). Tighten the nut to the desired amount of torque, or until it is tight if no torque specifications are available.