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How to Replace Door Locks The first line of defense is your door lock. It will stop unauthorized entry to your home. Locks may require replacement due to signs of wear and tear or other circumstances such as moving into a new house or a burglary. To begin, you must determine the size of your cylinder using the distance between the adjustment screw and the middle of the cylinder knob. This measurement will help you buy the lock that is right for you. Deadbolt Installing a deadbolt is a ideal way to secure your door against intruders. The bolt extends into the strike plate that is on the door frame when it's locked, making it much more difficult for burglars to gain entry into the door. A single-cylinder deadbolt can be activated by a key located on the outside and the thumb-turn mechanism that is located inside. A deadbolt will only work when it's properly installed however. The first step is to find out if the door has a hole for deadbolts or requires drilling. Mark the location of the hole to install the deadbolt on the surface of the door by using the template supplied with your lock installation set. Use a tape measure to determine the height of the deadbolt. Mark this high point on the door's edge. Use speedsquares to draw a straight line across the mark that you made for the bolt hole. Then, use a drill to bore this hole until it extends to the opposite side of the door. This could take a while. Then, sand down the hole and the edge of the door until it is smooth. It's also recommended to paint or stain the door at this point. Remove any visible screws from the deadbolt. This will reveal both the rear and front assembly of the deadbolt as well as its internal bolt. Remove the bolt and replace it with the new bolt to match the door hardware. It is necessary to remove the bolt from a setplate. After this, you'll need to chisel the area on the door frame for the strike plate. If your strike plate is not aligned, it's likely because the previous installer didn't correctly mortise it or a weatherstripping came along and altered the strike position. To fix this problem you'll need to remortise both the strike plate as well as the deadbolt. Close and lock the deadbolt after you've completed this step. Be sure the bolt extends into the strike plate and then test the key to make sure it is able to open and close smoothly. Knob It could make your home or business less secure If the knob on your door is worn. It may also make it harder to open or close the door, so it's recommended to replace it. Replacing the knob is an easy DIY task that should not take more than 30 minutes to complete. Make use of pliers or a screwdriver to remove any old knobs or handles. Be careful not to damage the other components of the door. Spray WD-40, or another dry lubricant, on the mechanism of your door knob before you begin. This will assist the new lock to move smoothly when you turn it. To ensure that it operates properly it is important to select the right knob and handle to match the doors you already have. If you don't already have a doorknob that is compatible then you'll have to buy a replacement. To begin the replacement process, first examine the old knob or handle to find what screws are holding it in place. If there aren't any screws, you can make use of a screwdriver and wedge it between the cover plate and the screws plate hidden and remove it. After removing the old knob, inspect it for signs of rust and damage. You'll need to clean it off if there are any scratches or dents however you don't need to do anything If the knob is in good condition. Install the new knob. It is important to first look over the two knobs to make sure that you've chosen the correct one for your door. You'll need to select one with an extender rod that will interlock with the rod mechanism of the second knob. Once you've positioned the new knob in the door's hole carefully slide it into the latch. Test the spring by pressing down on it repeatedly. The latch should spring up each time. Then, you can install the new knob and lock it to the rod mechanism on the first knob. Thread the long screws from the interior doorknob into the holes for the cylinder on the exterior knob and lock it into its place. Latch A latch is a steel piece that extends into the door jamb to secure it closed. It is operated by a knob or handle on the interior side of the door, or a thumb turn on the exterior side of the door. A deadbolt is a device used to secure a latch and keep intruders from breaking through the glass of the door. It also helps protect against intentional or accidental closing by children or animals. A latch can be installed using one cylinder deadbolt or double cylinder deadbolts depending on the security level you prefer. Installing a deadbolt is exactly the same as installing a latch, however there are some differences. To ensure that the new lock is compatible first, take a measurement of the setback on the doorjamb with a tape measure. The setback is the distance from the edge of the doorjamb to the middle of the hole to accommodate the latch faceplate. Setbacks for standard latches are 2 3/8 to 2. ¾ inches. If you have a greater setback, you may need to purchase a larger latch from a hardware store or locksmith. The next step is to drill an edge bore hole into the doorjamb to accommodate the latch plate. Utilize a chisel to smooth out the mortise of the latch and ensure it's deep enough to allow the faceplate of the new latch to be close to the doorjamb. Place the strikeplate on the floor to ensure it is positioned properly. If the strike is too high, you can push the door back or apply pressure using a tire iron or crowbar. This can also cause the doorjamb to break. This can be fixed by drilling a new hole through the doorjamb and then cutting the core from the old one. Installing the new strike plate is the final step. This can be done by fixing the new plate to the existing screw holes. Then you can use wood putty to fill in the old screw holes and the bolt hole that is not used. After the putty has dried then sand it to a smooth finish for an elegant finish. Strike An electric strike is the metallic part where the latch and deadbolt engage when the door is closed. It is an essential part of the lock's security because it prevents the door from opening and provides an additional level of resistance to force or kick. If a door is equipped with an electronic strike, it can be opened only with keys and the control unit that regulates its electrical impulses. In the past, putting in an electronic strike was as simple as cutting a portion of a doorjamb, which would release the latchbolt of a cylindrical lock from the pocket that is inside the strike. This is not only undesirable however, it also exposes the latchbolt mechanism and keeper to unauthorized users. Recently, several electric strikes manufacturers have come up with a “No Cut” type of strike that does not require a cutout in order to operate. The strikes use a unique design that allows the latchbolt and keeper to slide into the strike pocket without marring the doorjamb faceplate. The strike is equipped with an internal ramp that lifts the latchbolt and keeper when it receives an electrical impulse from a controller or reader. The retracting of the keeper and latchbolt causes them to rise on the ramp, thereby locking the door. When the door is shut the deadbolt remains extended and the latchbolt is retracted into the keeper. Installing an electronic strike is a simple procedure, particularly if you're replacing an existing strike. However, if you are upgrading to an electric strike to use with an access control system, you'll have to ensure that your new system is compatible with the type of lock you've installed. Also, double glazed door lock replacement must make sure that the strike is properly connected to your access control system and is configured for fail-safe operation. One way to safeguard against unauthorized access is to upgrade the strike on your doors to a robust strike plate. These plates use four to six screws of three inches instead of the two three-fourth inch screws typically used in standard strikes. The longer screws make it more difficult for anyone to break the frame and then reach inside to turn the thumb turn part of a single cylinder deadbolt.