If I leave my key at home, how can I match it?

You can match the key according to the lock cylinder, but if there is no spare key, it is recommended to replace the lock cylinder, which is safer. The main function of the lock core is to transmit the torque from the head, so as to drive other parts of the lock to unlock and lock. The lock head of padlock, drawer lock, door lock and bicycle lock has different structures and different ways to transmit torque, but the functions are the same.

Lock cylinder classification:

1, Class A lock core, the time for preventing technical unlocking is not less than 1 min, and the time for preventing destructive unlocking is not less than 15 min. Class A lock core is an old lock core. The key is a cross-shaped or crescent-shaped key with a convex keyway and a row of concave keyways on one or both sides. Thieves can use tin foil to open this key in a few seconds. If you still use this key at home, change it quickly. A-class lock core has been unable to prevent thieves.

2. Class B lock core, the technical unlocking time is not less than 5 minutes, and the impact unlocking time is not less than 30 minutes. The key of class B lock cylinder is flat or crescent, which is more complicated than that of class A key. One side or both sides of the keyway are provided with two rows of concave or cylindrical multi-point concave keyhole.

3, super class B lock core, the technical opening time is over 270 minutes. The key of the super B-class lock core is flat, and the keyway is single-sided or double-sided with two rows of concave and S-shaped, or the structure of internal and external double snake-shaped internal milling groove. It is the most complicated lock core and the safest lock core, and the tool can't even be opened after more than 270 minutes.

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