The part of the lock that the screws are in is known as the “faceplate. ”
Sometimes there will be screws in the exterior faceplate as well. If so, unscrew these as well, before attempting to pull it out.
In some cases, the set plate and bolt are not one piece. If so, once the set plate is removed you can pull out the bolt separately. If you did not unlock your deadbolt prior to removal, you can still remove the bolt. Just look for where the bolt connects to the locking mechanism and use a screwdriver to twist it open.
In most newer homes these measurements are standard. The hole is generally 2 1/8th inches. Most bolts are also adjustable to accommodate the size of your setback. It doesn’t hurt, however, to be cautious and get all measurements. [1] X Research source
To establish that your existing keys still work, you might want to get a deadbolt that is produced by the same brand as your current deadbolt. The brand name should be the set plate, the piece of metal that holds the bolt and connects it to the door frame.
Your new deadbolt should have a metal strike plate. The bolt in the deadlock should fit all the way into the jamb hole in the doorframe. The screws that hold the deadbolt into the door should be at least three inches long.
This should seem familiar; each step in installing your deadbolt will mirror the steps you took to remove the deadbolt. Every time that you insert a screw, you can begin by using your hands to get the screw in place. Eventually, however, you should progress to using a screwdriver or power tool to ensure that screw is fully inserted and secure. [4] X Research source
Altogether, there are three holes that run along the bolt. One, in the center, connects the exterior facepiece to the bolt. The other two, to the left and the right of this central hole, connect the interior facepiece to the bolt.
The screws should come standard with the deadbolt. It is best to use the screws that come with the deadbolt to ensure that they fit correctly.