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How to Replace Door Locks Door locks are the first line of defense against unauthorized access to your home. The locks may need to be replaced because of signs of wear and tear or other circumstances like 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 knob lock cylinder. This measurement will allow you to buy the right lock. Deadbolt Installing a deadbolt is excellent way to protect your door from intruders. The bolt extends into the strike plate that is on the doorframe when locked, making it much more difficult for burglars to gain entry into the door. A single cylinder deadbolt is activated with keys on the exterior side and a thumb turn part on the inside. A deadbolt will only work if it's installed correctly, though. First, you will need to determine if the door already has a hole to install deadbolts, or if it needs to be bored out. Mark the position of the hole for the deadbolt on top of the door using the template included with the lock installation set. Then, use your tape measure to determine how high the deadbolt should be. Mark this high point on the door's edge and use speedsquares to draw a straightline across the mark that you made for the bolt hole. Then using an electric drill, bore out the hole until it is on the opposite side of the door. This may take some time. Sand the hole and the door edge to smooth it. At this point, it's a good idea also to stain or paint your door. Once the door is ready, remove any screws visible on the existing deadbolt. This will reveal the front and back assembly of the deadbolt as well as the internal bolt. Then, remove the bolt and replace it by the new bolt to match your door hardware. It is necessary to remove the bolt from the setplate. After this is done it is time to chisel the area for the strike plate that is on the door frame. If your strike plate is not in alignment it could be because the previous installer did not mortise it properly or that a weatherstripping has changed the strike's location. To correct this issue you'll need to remortise the strike plate as well as the deadbolt. Close and lock the deadbolt when you have completed this step. Test the deadbolt by closing it and locking it after the bolt has been extended into the strike plate. Knob When a door knob is damaged it could make your home or business less secure. It may make it difficult to open or close the door, which is why it's recommended to replace the knob. Replacing a knob is a relatively simple DIY project that shouldn't take longer than 30 minutes to complete. You can use a screwdriver as well as pliers to get rid of the old knob or handle Be careful not to harm any of the other components on the door. Spray WD-40 or another dry lubricant on the mechanism of your door knob prior to you begin. This will allow the new lock slide effortlessly as you turn it. To ensure that it operates properly, it's important to choose the right knob and handle to match your existing doors. If you don't have a match you'll need to purchase an additional doorknob and latch plate. Before you begin the replacement, take a look at the knob that was previously used to see what screws are holding it in place. If there aren't screws to hold it in place, you can use a screwdriver to insert the cover plate in between the screws plate that is hidden. After taking the knob off take it apart and look for evidence of damage or rust. If the knob is damaged or has marks or scratches it's time clean it. Otherwise it shouldn't need any major work. Now it's time to install the new knob. First, examine the two new knobs to make sure that you're selecting the correct one for your door. You'll need to choose one with an extended rod that will interlock with the rod mechanism of the other knob. Once you've positioned the new knob over the door's hole, carefully place it in the latch. Test the spring by pressing it down repeatedly. The latch should spring up every time. Install the second knob, and lock it to the rod mechanism of the first knob. Then, thread the other long screws from the interior knob through the cylinder hole on the exterior doorknob and secure it. Latch A latch is a piece of metal that extends into the doorjamb to secure it shut. The latch is operated via a knob or handle on the inside of the door, or by a thumb-turn on the exterior. A deadbolt is a device used to secure a latch and prevent intruders from breaking through the glass of the door. It also protects against the accidental or deliberate closing of the door by children or pets. It is possible to install the latch using either a single-cylinder or double-cylinder deadbolt based on the level of security. Installing a latch requires the same steps similar to installing a deadbolt however there are some distinctions. First, you must measure the setback of the doorjamb with an instrument to make sure that the new lock will fit. The setback is measured from the edge of doorjamb all the way to the center of hole for the latch plate. Standard setbacks are 2 3/8 to 2. ¾ inches. If you have a greater setback, you might need to purchase a larger latch from a hardware store or locksmith. Next, make a hole for the latch plate in the doorjamb's edge. Use a chisel and chisel the latch mortise. Make sure the depth is sufficient for the faceplate to be flush with the doorjamb. Place the strikeplate on the floor to ensure that it's positioned correctly. If the strike is set too high, the door can be kicked in or pressure applied to it with a crowbar or tire iron. This can also cause the doorjamb to break. This can be repaired by drilling a new hole in the doorjamb, and chiseling the core out of the hole that was previously made. The final step is to mount the new strike plate, which can be accomplished by screwing it in place over the screw holes that are already in place. Then apply wood putty to cover the old screw holes and the bolt hole that will not be used. After the putty has dried, sand it to an even finish. Strike The metal piece that engages the deadbolt and latch when the door is closed is an electric strike. It is a vital part of the lock's overall safety, as it prevents the door from opening and gives additional resistance to force or kicking. If a door comes with an electronic strike, it can be opened only with an entry key and a control unit that regulates the electrical impulses. Traditionally the installation of an electric strike required cutting a section of the doorjamb in order to remotely remove a cylindrical lock's latchbolt from the pocket within the strike. bradford double glazed door lock replacement can be an inconvenience when it comes to the appearance of an opening as well as exposing the mechanism of the latchbolt and keeper to any unauthorised users. Recently, several electric strike makers have come up with a new type of electric strike dubbed the “No Cut” strike that doesn't require cutouts in the doorjamb to function. The strikes use a unique design that allows the latchbolt and keeper to slide into the strike pocket without damaging the doorjamb faceplate. The strike is equipped with an internal ramp that raises the keeper and latchbolt when it receives an electrical signal from a controller or reader. The latchbolt and keeper are lifted higher up the ramp by the retraction. When the door is closed the deadbolt remains in extended and the latchbolt is retracted into the keeper. Installing an electric strike can be an easy process, particularly in the case of replacing the strike on a previous door. However, if you are upgrading to an electric strike in an access control system, you'll need to make sure your new system is compatible with the model of lock you've installed. Also, you must ensure that the strike is properly connected to your access control system and is set up to operate in a safe manner. Upgrade your strike plates to heavy duty strike plates to stop unauthorized entry. The plates utilize four to six three-inch screws instead of the two, three-fourth inch screws typically employed in regular strikes. The longer screws make breaking the frame to reach the thumb turn piece on a single deadbolt cylinder more difficult.