A key is used by decorators when decorating, generally 2 pcs,
B.C key is for self-use, generally 4 pcs.
When B lock is used, A lock is useless, B C can still be used. The advantage of this is that even if the decorator is equipped with a key, there is no need to be afraid.
Anti-theft door lock core level: The anti-theft door lock core used in the market is basically divided into three levels, namely A-level, B-level, and super B-level (also known as C-level). According to the “National Standard for Mechanical Locks”, the anti-theft door lock cylinder has two levels A and B, and the super B level is an enhanced version of B level additionally developed by entrepreneurs.
A-level lock: At present, the A-level anti-theft lock keys on the market mainly have a flat key and a cross key. The internal structure of the A-level lock cylinder is very simple, limited to the change of the marbles, and the marble grooves are few and shallow. Anti-technical opening time within 1 minute, the mutual opening rate is extremely high. The marble structure is a single row of marbles or a cross lock.
Class B lock: The key of Class B lock is a flat key with double rows of marble slots. The difference from Class A lock is that the key surface has a row of curved and irregular lines. There are three main types of lock cylinders, computer double-row lock cylinders, double-row crescent lock cylinders, and double-sided blade lock cylinders. The anti-technical opening time is within 5 minutes, and the mutual opening rate is high. With a powerful twisting tool, the lock cylinder can be opened within 1 minute.
Super Class B lock (Class C): The key shape is a single-sided blade internally milled or externally milled key, and the lock cylinder type is a side column lock cylinder; it cannot be opened technically after 270 minutes by the Ministry of Public Security, and the regional mutual opening rate is zero ( One in 16 million). The pinball structure is locked by double-row blades and V-shaped side posts; if the lock cylinder is opened with a strong twisting tool, the inside of the lock cylinder will be damaged, and the lock will self-explode and lock, making it impossible to open.
Identify the level of the anti-theft door lock core: The best way to identify the level of the anti-theft lock is to use the key. You can easily understand the level of the anti-theft lock by looking at the key!