Here’s how to install a deadbolt lock for a more secure lock.

Things You may need :

• Electric Drill with drill bits, spade bits, and driver bits
• hole saw
• Wood chisel
• Deadbolt lock
• Marker or Pencil

1. Most deadbolt-lock manufacturers provide a template to help you install the lock. This template is will help to work easier with doors of different thicknesses and has reference points that may be marked on the door with an awl. The deadbolt should be at least 6″ above your doorknob.
2. Mark the reference points from the template, then start drilling with the use a hole saw and cut a hole for the deadbolt.
3. Use a 1 1/2″ spade bit to drill a hole through the edge of the door for the bolt .
4. Dry-fit the bolt into the hole, and trace around the faceplate. Use a wood chisel to mortise the area around the faceplate so that it will be flush with the door.
5. Continue mortising until the faceplate fits properly. Drill pilot holes, and secure the bolt to the door with screws.
6. Dry-fit the cylinder and thumb plate so you’ll know how the pieces fit together. Fit the exterior side onto the door first, making sure the writing is upright. Then set the interior piece in place, and align the screw holes with the mounting holes inside the lock. Fasten the deadbolt in place with screws.
7. Mark the end of the bolt with lipstick or paint. Close the door, and turn the deadbolt several times to mark the doorframe. Use a 7/8″ spade bit to drill two overlapping holes in the doorframe for the deadbolt (figure F). Mortise the area around the hole so the striker plate will fit flush with the doorframe. Drill pilot holes, and secure the striker plate to the door with screws.