How to replace the window lock of the security door?

The lock of the security door is easy to replace. First, remove the two screws of the handle with a Torx screwdriver, then find the most central screw for fixing the lock core at the middle lock tongue, unscrew the screws and pull out the lock core. The lock body does not need to be disassembled.

Actually, it's no use changing the lock. The king can open it in a few seconds It is most important to find a good lock cylinder first. Lock cores are classified into Grade A and Grade B ... Grade A: National professionals can't open the lock core within one minute without damaging it. Grade a is qualified, and grade b is qualified within five minutes. This standard has been in existence for many years, and it doesn't take 1 minute to open these locks by hitting the key. It is recommended to find the lock core of Wang Li 180 minutes anti-technology opening or Hunan Zhuangzhe brand 240 minutes anti-technology opening in the market. But what you have to consider is whether these lock cores can match your door. You can buy a class a lock core for 30 yuan.

The black swivel in the middle of the lock core is located in the middle of the lock core, which is the middle opening.

Deviation: it means that the black swivel in the middle of the lock core is biased to one side of the lock core, that is, the left and right sides are not the same width;

Lock cylinder length: refers to the full length of the lock cylinder, which is very important. If it is inconsistent, it will not be installed. Generally, a 50mm thick door is equipped with a 75mm lock core, and a 70mm door is equipped with a 90mm lock core.

Description of purchase: The traditional idea is that the heavier the lock core and key, the better, which is a misunderstanding. The guidance of professionals is as follows: first, look at the surface treatment, poor lock cores generally have rough surfaces, and good lock cores generally have good texture and strong light sensitivity; Second, look at the number of rows of marbles. Generally speaking, a single row of marbles is common in the market, which is the so-called class A lock. The opening ability is weak, and the ability to prevent drilling, prying and interruption is weak. Okay, usually double-row marbles. Third, look at the shape of the key (the internal structure of the lock core can be intuitively reflected from the key). At present, the common key shapes in the world are mainly cross-shaped and zigzag (because all aspects of performance can not meet the market demand, it has been gradually eliminated); The crescent key is better, but it has many defects, such as the technical opening time can not meet the requirements, and the ability to prevent drilling and interruption is weak. At present, there are many keys of the opposite sex in the world, such as high and low rows of teeth, double rows of teeth, snake-shaped anti-pulling bars and so on. , greatly improving the safety of locks, essentially a new breakthrough, but also a weather vane to guide the future lock market.