Improve the security of your home by installing a security bolt on all exterior doors, including the one between the garage or basement and the house. This is a relatively inexpensive project that you can do on your own. Not only will you improve the security of your home for yourself and your family, but you will also save money.


  1. Probably your security bolt includes a template to align it. Use it to place marks in the correct place for installation. The bolt should be centered on the doorknob, about 6 inches (15 cm) above its location and generally between 2 3/8 inches and 2 3/4 inches (6 to 6.9 cm) toward the center.
  2. Drill a 1/8 inch (3 mm) pilot hole through the center of the bolt mark and another through the center of the mark on the edge of the door. This will give the drill a place to start and maintain a straight alignment.
  3. Drill about 1 inch (2.5 cm) through the door with the drill, from the inside. Place the drill on the outside and complete the hole. This will prevent the wood from tearing at the back (there is a small bit in the center of the drill that will keep the hole aligned through the pilot hole).
  4. Place a common nail through the pilot hole that you have drilled in the edge of the door, to mark the location of the hole in the closing bracket. Use a 1 inch (2.5 cm) spade bit or 1 inch (2.5 cm) hole saw to drill a hole through the edge of the door into the space you have cut to place the bolt. Drill a 1 inch (2.5 cm) hole in the door frame, over the mark you made with the nail.
  5. Center the closing square on the hole you have cut in the door frame and mark the edge with a pencil. Make a notch with a multipurpose knife on that mark.
  6. Chisel the wood in the area of ​​the closing square, keeping the oblique edge of the chisel over the notches and hit the other end with a hammer. Remove enough material so that the closing bracket is at the same level as the door. Repeat this method for the faceplate on the edge of the door.
  7. Place the cylinder through the hole in the edge of the door. Check the exterior side and make sure any writing you have is right. Place the inner rosette plate in place and align the screw holes with the mounting holes inside the lock. Secure the mechanism in place with the long screws.
  8. Screw the face-plate over the edge of the door and the locking bracket into the frame, so that they are in place. Test the lock to make sure it operates smoothly and make the necessary adjustments.