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How to Replace Door Locks Your first security measure is your door lock. It can stop unauthorised entry into your home. Locks might need to be replaced due to wear and tear, or other situations such as moving into a new residence or a burglary. You can determine the size of your cylinder by measuring the distance from the center of the knoblock cylinder to the adjustment screw. This measurement will allow you to buy the lock that is right for you. Deadbolt If you want to make sure your door is safe from criminals, it's a great idea to install a deadbolt. When the bolt is extended into the strike plate of the doorframe, it makes it much more difficult for an intruder to get through the door. A single cylinder deadbolt is activated with an exterior key on the side and a thumb turn piece on the inside. Deadbolts will only work only if it is correctly installed. The first step is to determine if the door has a hole to install a deadbolt or if it has to be bored. With the template included with your lock installation kit, mark the location of the hole for the deadbolt on the door's surface. Then, use the 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 straight line across the mark you made for the bolt hole. Then, use a drill to bore this area until the hole reaches the opposite side of the door. This could take a bit of time. Sand the hole and the edge of the door to make it smooth. It's also recommended to stain or paint the door at this point. Remove any visible screws from the deadbolt. This will reveal the back and front assemblies of the deadbolt, as well as the internal bolt. Then, remove the bolt and replace it with a new bolt that matches the door hardware. You will need to unscrew the bolt from the setplate. Then, you'll need to chisel the door frame for the strike plate. If your strike plate is not aligned It's likely that the previous installer didn't correctly mortise it or a weatherstripping came along and changed the strike position. To fix this problem it is necessary to remortise both the strike plate as well as the deadbolt. Once this is completed Test the deadbolt by closing and locking it. Test the deadbolt by closing and locking it after the bolt has been extended into the strike plate. Knob If a door knob is worn out it could make your business or home less secure. It could also make it harder to open or close the door, which is why it's a good idea to replace it. It shouldn't take longer than 30 minutes. You can use a screwdriver or pliers to remove the old knob or handle, but be careful not to harm any other parts on the door. Spray WD-40, or a different dry lubricant, on the mechanism of your door knob prior to you begin. This will assist the new lock slide smoothly as you turn it. To ensure proper operation it is important to select the right knob and handle to match your existing doors. If you don't have a matching doorknob and handle, you'll need to purchase a replacement. To begin the replacement process, examine the old knob or handle to determine the screws that hold it in place. If there aren't any screws, you can use a screwdriver to insert between the cover plate and the hidden screws plate and pop it off. After removing the old knob examine it for signs of rust and damage. upvc door locks replacement repairmywindowsanddoors.co.uk to clean it off if you notice any marks or dents, but you shouldn't have to do anything major when the knob is in good shape. Now it's time to install the new one. You should first examine the two knobs to ensure that you are choosing the correct one for your door. You'll need to select one with an extending 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 insert it into the latch. Test the spring by pressing down on it repeatedly. The latch should spring back up every time. Install the second knob and secure it to the rod mechanism of the first knob. Thread the long screws from the interior doorknob into the cylinder holes on the outside knob and secure it in its place. Latch A latch is a piece metal that extends through the doorjamb to hold it closed. The latch is operated either via a knob or handle located inside the door, or a thumb-turn on the outside. The latch can be secured using deadbolts to stop thieves from breaking through the door's glass. It also provides protection from accidental or intentional closing of the door by pets or children. It is possible to install the latch using either a single-cylinder deadbolt, or a double-cylinder deadbolt, depending on your preferred level of security. Installing a deadbolt is exactly the same as installing a latch but there are some differences. First, measure the setback of the doorjamb with an instrument to make sure that the new lock will fit. The setback is the distance from the edge of the doorjamb to the center of the hole for the faceplate of the latch. A typical setback is 2 3/8 to 2 ¾ inches. If you have a greater setback, you may need to purchase a more substantial latch at a hardware store or locksmith. The next step is to drill an edge bore hole into the doorjamb for the latch plate. Utilize a chisel to cut the mortise of the latch. Make sure the depth is enough for the faceplate to be in line with the doorjamb. Place the strike plate in place to make sure it's in the right position. If the strike is too high, you can knock the door down or apply pressure with a tire iron or crowbar. This can also cause the doorjamb to crack. To fix this issue, the strike can be lowered by drilling another hole in the doorjamb and cutting out the core of the old hole. The final step is to install the new strike plate, which can be done by screwing it over the existing screw holes. Then apply wood putty to cover the holes from the previous screws and the bolt hole that is not used. After the putty has dried you can sand it until it has 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 an important part of the security of a lock, since it keeps the door shut and provides extra resistance to force or kicks applied to the door. If a door is equipped with an electric strike, it can only be opened using a key or the control unit that controls the electrical impulses. Traditionally the installation of an electric strike required cutting out a portion of the doorjamb to release a cylindrical lock's latchbolt from the pocket of the strike. This is an inconvenience in regards to the appearance of openings, and it also exposes the keeper mechanism and latchbolt to any unauthorised users. Recently, several electric strike manufacturers have created a new type of electric strike, dubbed the “No Cut” strike that doesn't need an opening in the doorjamb to operate. The strikes have a unique design that allows the latchbolt and keeper to slide into the pocket without damaging the doorjamb's faceplate. The strike is fitted with an internal ramp which lifts the latchbolt and keeper when it receives an indication from a reader. The latchbolt and keeper are lifted higher up the ramp by the retraction. When the door is closed, the deadbolt remains retracted, and the latchbolt is retracted into the keeper. Installing an electric strike is an easy process, particularly if you are replacing an existing strike door. If you're planning to upgrade an 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 connected to your access control system and that it is configured for fail-safe operation. Upgrade your strike plates to high duty strike plates to prevent unauthorised entry. These plates use up to six screws of three inches instead of the standard two screws of three-fourths inches. These 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 deadbolt cylinder.