How to choose a larva for a castle - general recommendations. Entrance door lock cylinder: types, possible problems, how to choose and replace with your own hands Larvae for door locks with offset

Helpful information

Mortise lock with latch for cylinder mechanism

A mortise lock with a latch for a cylinder mechanism is one of the most common types of locking devices. It is quite reliable and easy to use. This design provides for the possibility of replacing the larva, which will save on the purchase of a new locking mechanism.

As a rule, the reliability and quality of the inner larva as a whole determines the reliability of the lock itself. Therefore, you need to buy an internal mechanism only from trusted manufacturers, while taking into account the technical parameters of the cylinder. In the presented segment, the trademarks Elementis, Roto have proven themselves well - the TBM-Market catalog includes options of different sizes, with different types of larvae.

Entrance door lock larva buy in Moscow

A cylinder mechanism with a turntable is considered quite popular. It can be mounted on the front or interior door. But more often the cylinder mechanism for the lock is selected for entrance doors, because. at a relatively low cost, it provides reliable protection against hacking. A turntable is a special rotary handle that opens the lock from the inside without a key. At the same time, from the outside, a cylinder mortise door lock with a latch can be opened only with a key, like any other standard lock.

To buy a larva for a door lock, you must first measure the total length of the cylinder mechanism. This can be done independently using a regular ruler. If you plan to replace the internal device in an already installed lock, it is better to get the core and pick up a new one in the store that matches its size. If you have any difficulties in this matter, we are ready to advise you and help you with the choice.

We try to form the most complete assortment, so we are guaranteed to select the core for your castle. If necessary, we can offer high-quality door handles presented in the neighboring category.

    The larva is the main secret part of the castle, containing a special code. When choosing and buying a new lock, manufacturers leave the buyer the right to choose a larva for the locking mechanism. Buying a new larva is also necessary if the old one is broken or the key has been lost.

    Parameters of lock larvae

    First of all, you need to decide which particular larva is needed for the castle in each case. If, for example, for the larva in the lock there is a through groove in the form of a drop, the dimensions of which are: 34 mm in height, 10 mm in the width of the protruding part of the part, and 17 mm in diameter of the rounded part, then such a lock larva is made according to European standards DIN. When choosing a European standard larvae, certain difficulties may arise. Of course, any larva is suitable for the castle, since they all have the same size. On the other hand, we have the widest range.

    If the larva does not correspond to European standard sizes or has a different shape, then there is not much choice, and only the same mechanism from a certain manufacturer will do. In the most extreme case, it may be a Chinese copy of very dubious quality.

    Separately, it should be noted some models of locks from popular manufacturers from Israel - Mul-t-lock and SuperLock. These models comply with European standards and at the same time are equipped with a non-standard drive, which looks like a gear, not a cam. However, this does not pose any problem, since manufacturers of secrets for locks supply their products with gear drives, so that for such locks you can safely pick up a larva of any suitable manufacturer.

    It should be noted that with the same cross section, the length of the outer and inner parts of the cylinders may differ. In this case, the length of the inner part of the larva only affects the appearance of the part. The most important thing is that the end of the secret itself does not hide behind the decorative lining of the lock or door handle. As for the length of the outer part, it plays a more important role. If the design of the lock does not imply the presence of an armored lining, then the end of the larva must be strictly flush with the door strip. In this case, a small protrusion is allowed - no more than 3 mm.

    The larger the protrusion, the easier it is for a thief to open the larva by destroying it with, for example, an ordinary hammer. If there is an armored overlay, then the end of the secret should be as close as possible to its surface.

    Types of keys and the quality of the secrets of the lock larvae

    The type of mechanism of the larva is easiest to determine by the appearance of the key. For example, classic cylinder locks work with an English key. The blade of such a key is flat or figured, equipped with a serrated thread resembling a saw blade.

    All locking elements are in the same plane. Almost all cylinder-type locks belong to the budget product segment. You can buy an inexpensive larva that opens with an English key for those premises that are not at high risk of opening, or in the case when it becomes necessary to provide the key to the premises to strangers.

    If the key has a cruciform shape, then such a lock is quite easy to crack. Despite the fact that the cross-shaped key looks quite impressive, the secret of the lock contains only a few hundred combinations, which greatly facilitates the selection of a master key. In addition, the well of such a lock is quite convenient and wide for working with a master key. Such a lock will help only from "good people", for professional thieves it does not represent a serious obstacle. Cross-shaped mechanisms are especially fond of making the Chinese.

    A semicircular disk wrench for DIN standard larvae can be found quite rarely, and the attitude towards such products is rather ambiguous. In the vast majority of cases, these are very simple mechanisms with minimal resistance to hacking and an elementary secret. However, there are also very reliable products, mainly from the Finnish manufacturer Abloy. That is why such keys are called Finnish. If you decide to buy a mechanism of this type, then you should opt for Abloy products.

    The most serious protection can be provided by locking mechanisms that open with a punched card key. Such a key looks like a rectangular plate with a large number of recesses and grooves. Perforated keys are double-sided and are inserted into the keyhole horizontally. Larvae of this type belong to the middle price category. It is almost impossible to open them with conventional means. To enter the premises, criminals use special equipment or try to destroy the lock or the door entirely.

    Resistance of various types of locking mechanisms to opening

    The most high-quality and reliable keys are made on the basis of special designs - punched cards. For reliability, manufacturers supply mechanisms with special magnetic or electronic recognition systems, combine different types of secrets. In addition to recesses and protrusions on the surface of the key, there may also be lateral teeth, various kinds of irregularly shaped grooves, etc. All secret elements are located with some offset from the vertical direction, asymmetrically.

    For any key, you can choose a larva of suitable quality. If the mechanism of the larva is “sharpened” primarily for secrecy, then the materials from which all the moving parts of the lock mechanism are made are responsible for its service life. It is preferable that all the main elements of the castle be steel. If a manufacturer uses silumin, brass and other base and fragile materials, this is a bad manufacturer and the quality of his products is corresponding.

    Most buyers traditionally consider the level of secrecy to be the main indicator of the quality of a larva. But in practice, the very concept of "secrecy" is rather arbitrary.

    It implies that the mechanism contains a number of mating elements that occupy a certain position necessary to unlock the lock.

    The simplest and cheapest models have only 4-5 pairs of pins, the point of contact of which must be strictly on the line of rotation to ensure free rotation of the core. Inside complex and expensive devices, the number of pins reaches 12 or more pairs. In any case, the number of possible combinations is more indicative of the technical perfection of the lock than of its "secrecy", which depends, first of all, on the quality of work and the features of the technological process.

    Thus, the number of mating pairs of parts is of secondary importance, and the method of arranging and arranging the pins relative to each other comes to the fore. The developers of locking mechanisms, first of all, try to make the task of burglars as difficult as possible - they make a keyhole of a small size and complex shape, supply the lock with additional elements that prevent the master key from working effectively, make false channels and moves, complicate the relief of contact surfaces, add the need to make an extra turn, and .etc. - to list all the methods of dealing with breaking locks, a separate article is needed.

    Thus, even mechanisms with an average level of protection can greatly complicate the work of even the most experienced burglar - as a result, opening the lock will take a long time, if at all possible.

    However, criminals also follow the development of modern technologies. Recently, the so-called bumping has become especially widespread. This method of hacking does not require any special qualifications or prior training. You only need a set of special bump keys of different configurations. Such a key is inserted into the keyhole, slightly turned to slightly tighten the mechanism, after which the attacker strikes the head of the bump key. From vibration, the elements of the secret of the lock become in the right position, and the lock opens.

    It is possible to provide protection against bumping with the help of special electronic or magnetic codes, as well as the installation of special larvae without springs.

The key to protecting your doors is a quality lock cylinder. With a deliberate approach, the secret, as the larva or cylinder of the lock is called differently, can protect you from almost any break-ins and thefts.

The lock cylinder is an important element of the castle. Its quality is affected by:

  1. The complexity of the grooves;
  2. alloy quality.

Types of cylinders

  1. Like a castle. If the lock is padlocked, a special padlock is used. If mortise, respectively, mortise;
  2. By the number of holes for the key. In the case of a mortise lock, there are 2 types of cylinders. The first type is characterized by the fact that the door is locked with a key from both sides. The second one is different in that on the inside of the door there will not be a key hole, but a special handle for locking;
  3. Along the length of the lock cylinder. Usually depends on the thickness of the door.

Our services

A high-quality lock cylinder is a guarantee of the safety of your home. On our site you will find many options for the lock larvae and choose the best one for you. The company "VashZamok" is distinguished by a guarantee of product quality and stability in the market. To save your time, we offer the possibility of delivery.

For reliable protection of your apartment, house or any other premises, our store in Moscow offers high-quality door locks. They are available in several options - brass and aluminum. Do not forget that when choosing a door larva, you should focus on the main color of the lock - there should be no differences in tone. We offer various color shades of the product:

  • . gold;
  • . chromium;
  • . nickel.

The mechanism of secrecy of the products presented is different: there are both cylinder and lever options.

Cylinder mechanism of secrecy

One of the most popular today. It is also called the "English castle". Its main element is a cylinder that rotates if it reads the code of only "its" key.

Level mechanism of secrecy

Such a lock is common for entrance iron, metal doors. This type is based on a set of plates that, under the action of the teeth of the key, line up in a certain way and allow you to turn the mechanism and open the door.


Before you buy an entrance door lock cylinder, pay attention to its length and width, choose exactly the one that suits your lock design. The assortment of our store includes variations of both small and large sizes: 30/30, 35/35, 40/40, 45/55, 60/50, etc.


Also available:

  1. 1) bilateral - both from the outside and from the inside the door is opened with a key;
  2. 2) with a turntable - from the inside the door is opened using a special device - a turntable.
  3. 3) for entrance doors;
  4. 4) for interior.

In the set, one to five keys are attached to each larva for the door.

The price depends on several parameters: size, material, mechanism, manufacturer, and varies from 100 to 4000 rubles.

You can buy a larva for a door both in our store and by ordering them on the website or by phone in Moscow and Perm.

The online store of door locks offers cylinders (larvae) for locks of imported and domestic manufacturers. Also in the assortment are half-cylinders, oval cylinders and turn signals for cylinders (turntables).

The secret part of the cylinder lock is the cylinder or cylinder of the door lock, a product of precision technology. The lock cylinder is fixed inside or outside the lock itself and can only be turned with the key inserted into the hole. The secret mechanism is usually located in a standard case, thanks to which the cylinders of different manufacturers can be interchanged, i.e. they are compatible with each other. Lock cylinders are very common in our time because of their ease of use (small key size, weak turning force during rotation, also the main plus - if necessary, not the entire lock changes, but only the lock cylinder - its secret part. Large reinforced cylinder mechanisms and larvae with protection against most known methods of criminal autopsy are popular.

One of the types of lock secrecy mechanisms is a cylinder mechanism. The structural element of the lock, of which the cylinder is a part, can only be activated when the native (regular) key is inserted into the lock hole. This category includes pin, disk, frame, magnetic and some special secrecy mechanisms. All manufacturers produce cylinder mechanisms of the same shape, thanks to which the "larvae" of different manufacturers are interchangeable with each other. This fact determines the huge popularity of mechanisms of this type in the segment of household locks.

The main advantage of cylinder mechanisms is the ease of replacing or repairing the lock. If it becomes necessary to change the lock, it is enough to replace only the central secret mechanism - the cylinder. The principle of operation of this mechanism is to line up the pins (needles) inside the cylinder in a certain combination, the pins take on the configuration of the inserted key. Someone else's key in the process of opening the door will enter the wrong combination of pins, and the lock will not open. The secrecy of the lock directly depends on the number of pins, their manufacturing accuracy, as well as protection against unauthorized manipulations.

The protection class of cylinder mechanisms varies from the first to the sixth. It depends on the number of pins, security mechanisms, case material, and additional anti-vandal features. When installing the mechanism in the lock, it is possible to equip it with additional protection - an armor plate.

Our online store represents only the main range of cylinder mechanisms. If you want to buy a cylinder whose model is not available on our website, you can always contact us and order the model you need.

In our online store you can buy cylinders for locks and other locking mechanisms at affordable prices and at any time convenient for you.