The best way to identify the level of the anti-theft lock is to identify it with a key. You can easily understand the level of the anti-theft lock at a glance! Please see the picture below for details:

We can see from the picture that the more complex the key, the higher the level of the anti-theft lock, and the safer it is. To judge the level of changing the lock cylinder, you can first look at the key to distinguish. When we usually buy a lock, we must not look at the design of the key handle, the most critical thing is the design of the key itself!
Class A lock
At present, the A-class anti-theft lock keys on the market mainly have a word key and a cross key. The internal structure of the A-level lock cylinder is very simple, limited to the change of the marble, and the marble groove is few and shallow. Within 1 minute of anti-technical opening time, the mutual opening rate is extremely high. The marble structure is a single row of marbles or a cross lock.
Class B lock
The B-level lock key is a flat key with double rows of billiard slots. The difference from the A-level lock is that there is an additional row of curved lines on the key surface. There are three main types of lock cylinders, computer double-row lock cylinders, double-row crescent lock cylinders, and double-sided blade lock cylinders. Within 5 minutes of anti-technical opening time, the mutual opening rate is high. With a strong twisting tool, the lock cylinder can be opened within 1 minute.
Super B lock
The shape of the key is a single-sided blade internal milling slot or external milling slot key, and the type of the lock core is the side cylinder lock core; it cannot be opened technically by the Ministry of Public Security for 270 minutes. . The billiard structure is a double-row blade plus V-shaped side column lock; if the lock core is opened with a strong torsion tool, the inside of the lock core is destroyed, and the self-explosion locks, resulting in the failure to open.
Lock maintenance tips
During the use of the lock, regularly (half a year or once a year) or when the key is not inserted smoothly, do not use any liquid oils such as edible oil as lubricants to avoid the grease sticking to the spring of the bullet and causing the lock to fail Turned to not open. Usually, you can use the pencil at home to paint on the key, and then insert the lock cylinder to turn a few times to play a lubricating role. In addition, professional lubricants and rust inhibitors for locks are also available. Some zinc alloy and copper locks, when installed on the door for a long time, will find "spots". This phenomenon is not rust, but oxidation. If this happens, just use the surface wax to wipe it. You can remove the spots.
How to pick a safe lock
The first trick: buy a lock to see the "teeth" of the key. The more teeth, the deeper the teeth, the more complicated the arrangement, the more difficult to open, and the better the anti-theft performance.
The second measure: pick the lock and weigh two, one is the weight and the other is the lock core. The heavier the weight, the better the quality of the lock cylinder. The more beads in the lock cylinder, the better the anti-theft function.
The third measure: choose the lock core to see the color, and the color to see the workmanship. The good quality lock core adopts electroplating treatment, the surface is smooth and the color is bright. Among them, the dark-yellow color is a copper core, which is relatively strong and has good anti-theft performance. The lock core has a dull color, and the gray-white color with bubbles is a zinc alloy.
The fourth measure: the key is inserted into the lock cylinder and the anti-theft performance of the card is poor. After the key is half inserted, rotate it clockwise or counterclockwise with 5 to 7 force and continue to press the key into the lock port. The stuck key indicates that the lock core is anti-theft Poor performance, smooth insertion into the lock cylinder in a half-rotation state shows good anti-theft effect.
Class A lock
At present, the A-class anti-theft lock keys on the market mainly have a word key and a cross key. The internal structure of the A-level lock cylinder is very simple, limited to the change of the marble, and the marble groove is few and shallow. Within 1 minute of anti-technical opening time, the mutual opening rate is extremely high. The marble structure is a single row of marbles or a cross lock.
Class B lock
The B-level lock key is a flat key with double rows of billiard slots. The difference from the A-level lock is that there is an additional row of curved lines on the key surface. There are three main types of lock cylinders, computer double-row lock cylinders, double-row crescent lock cylinders, and double-sided blade lock cylinders. Within 5 minutes of anti-technical opening time, the mutual opening rate is high. With a strong twisting tool, the lock cylinder can be opened within 1 minute.
The shape of the super B-level lock key is a single-sided blade internal milling slot or external milling slot key. The type of the lock core is a side column lock core; it cannot be opened technically by the Ministry of Public Security for 270 minutes, and the regional mutual opening rate is zero (16 million) One-half). The billiard structure is a double-row blade plus V-shaped side column lock; if the lock core is opened with a strong torsion tool, the inside of the lock core is destroyed, and the self-explosion locks, resulting in the failure to open.
Lock maintenance tips
During the use of the lock, regularly (half a year or once a year) or when the key is not inserted smoothly, do not use any liquid oils such as edible oil as lubricants to avoid the grease sticking to the spring of the bullet and causing the lock Turned to not open. Usually, you can use the pencil at home to paint on the key, and then insert the lock cylinder to turn a few times to play a lubricating role. In addition, professional lubricants and rust inhibitors for locks are also available. Some zinc alloy and copper locks, when installed on the door for a long time, will find "spots". This phenomenon is not rust, but oxidation. If this happens, just use the surface wax to wipe it. You can remove the spots.
How to pick the first lock of peace of mind: buy a lock and see the "teeth" of the key. The more teeth, the deeper the teeth, the more complicated the arrangement, the more difficult to open, and the better the anti-theft performance.
The second measure: pick the lock and weigh two, one is the weight and the other is the lock core. The heavier the weight, the better the quality of the lock cylinder. The more beads in the lock cylinder, the better the anti-theft function.
The third measure: choose the lock core to see the color, and the color to see the workmanship. The good quality lock core adopts electroplating treatment, the surface is smooth and the color is bright. Among them, the dark-yellow color is a copper core, which is relatively strong and has good anti-theft performance. The lock core has a dull color, and the gray-white color with bubbles is a zinc alloy. The anti-theft performance is general.
The fourth measure: the key is inserted into the lock cylinder and the anti-theft performance of the card is poor. After the key is half inserted, rotate it clockwise or counterclockwise with 5 to 7 force and continue to press the key into the lock port. Poor performance, smooth insertion into the lock cylinder in a half-rotation state shows good anti-theft effect.