How to change the lock core of the security door and under what circumstances?

How to change the lock core of the security door? Before replacing the lock core, the first thing to determine is whether the lock core is really broken, so under what circumstances should the lock core be replaced? Now I'll take you to know about it.

Under what circumstances should I change the lock cylinder?

First, if you are a serrated key with poor anti-theft performance (generally Grade A), it is recommended to upgrade the lock core.

Second, the lock core also has a certain service life, which is prone to unlocking difficulties, such as being stuck when unlocking. Third, your lock core has been filled with edible oil or non-professional lubricant (this will easily absorb metal chips and affect the lock core opening), and graphite is generally used for lock core lubrication.

4. If your keyhole is blocked by foreign objects or has mechanical prying marks, it is recommended to replace it.

If your house is rented to others, it is recommended to replace the lock cylinder.

6. If your house has just been renovated, the renovation key has been used by the master.

How to change the lock core of security door

1, after selecting the lock cylinder, unscrew the two screws at the top and bottom of the hand panel. These two screws are mainly used to fix the panel, as long as the Phillips screwdriver is ready, it is very simple.

2. After the screws are tightened, put the screws away, unscrew the lock core and put the screws on both sides of the sleeve, but be careful not to tighten these two screws too tightly when installing, so as to avoid the handle of the security door being too tight to open. Remove the handle first, and then remove the lock cap.

3. Put the lock cylinder into the sleeve and take it out, and put it together with the screw. Remember the steps when disassembling, and the return is the same. All removed items are stored in a unified way.

Don't lose it. 4. Unscrew the screw fixing the lock cylinder and remove it to the lock cylinder. If the lock cylinder cannot be pulled out by hand after removing the screw, knock it off with the left or right lock head of the hammer and try again.

5. Install the lock cylinder anti-theft shell according to step 3, and then install the handle. Before installing the handle, insert the safety bolt and then install the handle on it.

6. Install He Long's inner and outer handles. It is best for someone to help hold them together, so that they can contact each other symmetrically, and then proceed to the next step.

7. Adjust the inner and outer handles to ensure that they are in harmony, align the screw holes with the nuts over there, or rotate the screws after lighting with a flashlight.

8. Insert the screw vertically. If the internal nuts are not aligned when inserting the screws, please shake the screws with your fingers. Generally, friends who have rotated screws can realize whether the screws are aligned.

How to choose a good lock core for anti-theft door

1. Buying the lock core of the security door depends on the "teeth" of the key. The more teeth, the deeper the teeth, the more complicated the arrangement, the more difficult it is to open, and the better the anti-theft performance.

2. Choosing the lock core of the security door depends on the color, and the workmanship is better than the color. The lock core of high-quality security door is electroplated with smooth surface and bright color. Among them, the dark yellow copper core is relatively strong and has good anti-theft performance. The lock core of the security door is dim in color, and the zinc alloy with bubbles is gray in color, so the security performance is average.

3. When the key is rotated and inserted into the lock core of the security door, the anti-theft performance is poor. After the key is inserted halfway, turn 5 to 7 parts clockwise or counterclockwise, and continue to press the key into the lock. The locked key indicates that the lock core of the security door has poor anti-theft performance, and the anti-theft effect is good when it rotates smoothly for half.