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How to Replace Door Locks Door locks are the first line of defense against unauthorized access to your home. Locks may need to be replaced due to wear and tear or other circumstances like moving into a new home or a break-in. To begin, you must determine your cylinder size by measuring the distance between the adjustment screw and the middle of the knob lock cylinder. This measurement will allow you to purchase the appropriate lock. Deadbolt Installing a deadbolt can be a ideal way to secure your door from burglars. When the bolt is extended into the strike plate of the doorframe it makes it harder for an intruder to break through the door. A single cylinder deadbolt can be activated with a key on the exterior side and a thumb turn piece on the inside. A deadbolt will only work only if it is correctly installed. The first step is to determine if the door has a hole for deadbolts, or if it requires drilling. Mark the position of the hole for the deadbolt on the exterior of the door by using the template supplied with the lock installation set. Utilize your tape measure to determine the height of the deadbolt. Then, mark this high point on the outside of the door. You can then use a speed square to draw straight lines across the mark you made for the bolt hole. Next, use a power drill to drill this area until the hole is on the other side of the door. It may take a while. Then, sand down the hole and the edge of the door so that it's smooth. At this stage, it's a great idea to paint or stain your door. Remove any screws that are visible from the deadbolt. This will reveal the front and rear assemblies of the deadbolt as well as its bolt inside. Then, remove the bolt and replace it by a new one to match your door hardware. The bolt is usually connected to a set plate which you'll need to unscrew. After that it is time to cut out the space for the strike plate on the door frame. If your strike plate is not aligned, it's likely because the previous installer didn't correctly mortise it or a weatherstripping was installed and changed the strike's position. You will need to re-mortise the strike plate and possibly even the deadbolt to correct this problem. Close and lock the deadbolt when you've completed this step. Be sure the bolt is extending into the strike plate, and then test the key to ensure it opens and closes effortlessly. Knob If the knob on your door is damaged, it can make your business or home less secure. It could also make opening and closing the door more difficult, which is why it is a good idea for you to replace it. Replacing the knob is an easy DIY task that should not take less than 30 minutes to complete. You can use a screwdriver as well as pliers to take off the knob or handle that was previously used, but be careful not to scratch any of the other components on the door. Spray WD-40, or a different dry lubricant on the mechanism of your door knob prior to you begin. This will help the new lock slide effortlessly when you turn it. To ensure proper operation, it's important to choose a knob and handle that match the doors you already have. If you don't already have a doorknob that is compatible and handle, you'll need to purchase a replacement. To begin the replacement process, look over the knob or handle to see what screws hold it in place. If there are no screws, you can use the screwdriver to wedge the cover plate into the screws plate that is hidden. After you have removed the knob, inspect it for indications of damage and rust. If the knob shows any marks or scratches then you'll need clean it. Otherwise, it shouldn't require any major work. It's time to install the new knob. Begin by examining the new knobs to make sure that you're selecting the correct one for your door. You'll want to pick one that has an extending rod that's designed to lock into the rod mechanism of the second knob. Once you've put the new knob in the hole in the door, carefully place it in the latch. Test the spring by pressing it repeatedly. The latch should rise every time. Install the second knob and lock it to the rod mechanism of the first knob. Thread in the other long screws from the interior knob through the hole for the cylinder on the doorknob outside and secure it. Latch A latch is a steel piece that extends out into the doorjamb to secure it closed. It is operated by a handle or knob 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 prevent burglars from piercing the glass of the door. It also provides protection from accidental or intentional closing of the door by pets or children. A latch can be installed with one cylinder deadbolt or a double cylinder deadbolt, based on the level of security you prefer. Installing a deadbolt is the same as installing a latch, but there are some differences. To make sure that the new lock will work first, take a measurement of the setback on the doorjamb with the tape measure. The setback is the distance from the edge of the doorjamb, to the center of the hole that will be used for the latch faceplate. The standard setback is 2 3/8 to 2. ¾ inches. If your setback is higher it is possible to purchase a latch that is longer from a hardware or locksmith store. Then, drill a hole for the latch plate into the doorjamb's edge. Use a chisel and cut the mortise of the latch. Make sure that the depth is enough to allow the faceplate to be in line with the doorjamb. Tape the strike plate in the correct position to ensure it's in the right position. If the strike is too high, you can knock the door down or apply pressure with an iron tire or crowbar. This can also cause the doorjamb's to crack. This can be fixed by drilling a new hole through the doorjamb, and cutting the core from the hole that was previously made. The last step is to put in the new strike plate, which can be done by screwing it in place over the screw holes that are already in place. Then you can use wood putty to fill in the old screw holes and the bolt hole that will not be used. After the putty has dried then sand it to a smooth finish. Strike The piece of metal that is inserted between the latch and deadbolt when the door is shut is an electric strike. It is a vital component of the overall security of a lock since it helps keep the door shut and offers additional resistance to force or kicks applied to the door. If a door is equipped with an electric strike, it will only be opened using an entry key or the control unit that controls the electrical impulses. Traditionally, installing an electric strike involved cutting a section of the doorjamb to remotely remove the latchbolt of a cylindrical lock from the pocket in the strike. This is not only undesirable however, it also exposes the latchbolt mechanism and keeper to unauthorized users. Recently, a number of electric strike manufacturers have created a brand new electric strike called the “No Cut” strike that doesn't need cutouts in the doorjamb to function. These strikes use a special design that allows the latchbolt and keeper to slide into the pocket without damaging the doorjamb's faceplate. The strike has an internal ramp that raises the keeper and latchbolt when it receives an electrical signal from a reader or controller. The latchbolt and keeper are pushed higher up the ramp due to retraction. When the door is closed the deadbolt remains in at a lower position and the latchbolt retracts into the keeper. Installing double glazed door lock replacement woking is a simple process, particularly in the case of replacing an existing strike. If you're upgrading an existing access control system to an electric strike, you must make sure that the new system is compatible. Also, you must make sure that the strike is properly wired to your access control system and is configured for fail-safe operation. One way to protect against intrusions by thieves is to upgrade the strike on your doors to a heavy-duty strike plate. The plates utilize four to six three-inch screws instead of the two three-fourth inch screws commonly employed in regular strikes. The longer screws make it more difficult for people to break the frame and then reach inside to turn the thumb turn piece of a single cylinder deadbolt.