Door lock for metal door: types, description, choice

A huge number of owners of apartments and houses in an effort to make their home a solid fortress installs metal doors. And these are the right actions, but they can be completely useless if the installed lock does not perform direct duties, will differ in poor quality raw materials and susceptibility to easy hacking. Choose the right mechanism is very easy, you just need to understand the wide range offered in the modern market.

Types of locks in the class of resistance to burglary

To the door hardware belongs a huge amount of goods. These are various door locks, hinges, restraints, handles, bolts and other structures. But now we will talk about the locking device of the door.

The degree of security of the lock from opening depends on the material of the base and the level of secrecy of the mechanism acting inside.

There are four classes of burglary:

• Locks, which can be opened in just a few minutes;
• Design, broken by experienced masters for a period of 5 to 15 minutes;
• Mechanisms of the third class, with improved protective characteristics, for the opening of which it takes more than 15 minutes;
• The most reliable locks, for the opening of which you need to spend more than half an hour.

Distribution by type of secret mechanism used

Most often in everyday life there are five types of keyed secret designs:

• Suvaldnye;
• Cylinder;
• Electronic;
• Code;
• Crossbar.

The last three types of secret mechanisms are used very rarely, because such door locks for entrance doors have a lot of serious flaws. They can not be called reliable.

Code devices, as a rule, are mounted on the doors of entrances. They open without using keys by entering a digital combination. The unreliability of such locks lies in the fact that scammers can spy on the cipher, guess it or find out through a special electronic panel.

The lock locks consist of internal bolts that open by pressing the key on the inner part of them. Such mechanisms are characterized by short service life and ease of opening.

Electronic locks for entrance doors require the availability of backup power sources, because without them they simply cease to function. Such mechanisms very quickly deteriorate, often do not respond to the signal from the control panel, which are not resistant to high and low temperatures.

It is best to buy a door lock for a metal cylinder door or a lever type. These structures are considered to be the most reliable and resistant to break-ins. The principle of operation of the lock of the first type is that a combination of pins outwardly resembling needles is arranged to rotate the cylindrical block. And in the mechanism of operation under the influence of a key, a secret mechanism turns, and a set of plates forms a certain combination.

Types of locks by installation method

There are three types of mechanisms: overhead, hinged and mortise.

Installation of door locks of a hinged type is most often used for garages and sheds. Each product from this category consists of a body and an arc, one end of which is fixed and rotated around the axis, and the second is locked by the key entering the mechanism.

Surface structures are attached to the surface of the door leaf, practically without causing damage. They are very easy to mount and attach to other devices.

Mortise door lock for a metal door is usually installed inside the case. Access to the well in this case is provided through drilled holes, covered with decorative patches. Such designs are very popular. They do not spoil the aesthetically attractive appearance of the door and can be mounted both in the front door and in the interior.

Distribution of locks by type of action

There are two types of mechanisms:

• Locking, not having in the structure of the handles and latches. They are mounted above the level of the locating lock. Such products are used only for locking.
• Locking-locking. The structure of such locks includes both latches and handles with a lock. This is the most common type of locking mechanism, which very comfortably fixes the position of the door and does not require extra effort when closing. Most often, such a lock is mounted a meter away from the floor surface in the lower part of the case.

Distribution by type of secrecy

The door lock mechanism can have various internal and external parameters. This is the strength of the design, and the number of combinations used, and the probability of a key match, and even the degree of protection against damage by skips.

All this is included in the degree of secrecy, of which only three stand out:

• Higher education. The door lock device uses a complex combination of pins and a thoughtful profile of the device. A protective mechanism is applied that is resistant to chemicals and physical force. The number of secret combinations used varies from 100 thousand to one billion. Assembly and details of high accuracy.
• Average. A rather complex combination of pins is used, but protection against hacking is not always there. The body and structural parts are made of materials with great strength. Typically, the body and handles are of poor quality, and the crossbars of the system are high. The number of combinations used varies from 5,000 to 50,000.
• Low. Such door locks for entrance doors are not protected from mechanical impact. Their parts are not of high quality, however, like the assembly. Simple combinations of pins and classical key profiles are used. The number of combinations involved ranges from 10 to 10 thousand.

Locks with cylinder system: resistance to burglary

The degree of protection against mechanical impact depends directly on the model itself and the manufacturer. If you buy a domestic door lock, the price of which will be surprisingly ridiculous, it is unlikely that you will be able to protect your home, because such designs can be opened with a regular hairpin.

It is worth paying attention to foreign-made products. As a rule, such mechanisms are more qualitative and resistant to various types of external and internal influences.

Locks type: resistance to burglary

Burglary resistance of such mechanisms depends on the number of combinations of protrusions on the surface of the key. This parameter can be easily calculated using a special formula: multiply the number of lock locks by the number of protrusions. On average, this ratio is in the range of 50,000 to 100,000 combinations, which is why scammers use brute methods of breaking the integrity of the case, instead of master keys.

The door lock for the metal door of the lever type will be more resistant to burglary in the presence of false protrusions. In addition, the well can always be protected with armored plates, sheathing of metal sheets or other durable materials.

Dismantling of the old structure before installing a new locking mechanism

If the installation of door locks is made in a new metal door, then it is possible to limit one volume of work. It is enough only to purchase the mechanism you like and proceed with its installation. But in the event that the door lock internal should come to replace the old design, you have to remove the old device before buying a new one.

If the previous mechanism was installed without larvae of fixation and handles, then complications in the process of dismantling will not arise. You just need to unscrew the screws for fixing from the end panel of the door surface, and then take out the door lock for the metal door. This method is excellent for suvald type designs.

In the presence of a fixed cylinder, you must first obtain a screw from the end plate, which runs through the entire surface of the mechanism. Then the door lock device is easily removed from the opening.

In some cases, the problem can create decorative overlays that do not provide access to the body of the device. As a rule, such elements are fastened by means of bolts, which are removed with a conventional screwdriver.

Rules for the care of locks

It is very important not to forget to take care of key mechanisms during their operation. A door lock, the price of which depends on the type of secrecy, the manufacturer and the materials used, may suffer from the effects of moisture and frost. In such situations it is necessary to regularly use special solutions to prevent the appearance of rust.

Some experts advise to lubricate the lock from inside with engine oil, but this is not always a good option. Over time, the larvae of the device may accumulate dirt and metal shavings, and you will have to purchase a new locking mechanism.

Conclusion

To increase the burglary resistance and prevent robbers from quickly entering the house or apartment, it is better to install several protective mechanisms at once . For example, the main lock can be used, and help him with a cylindrical waybill.

When choosing the mechanism for the entrance door, do not forget to pay attention to the accuracy of its assembly, the material of the parts, the cost, durability, ease of operation. Also, be sure to take into account the specifics of your door.

Do not save on a device that should protect you and your family. It is best to give preference to proven and reliable manufacturers.