What does the security door lock cylinder grade B grade C mean

1. What is a Class B anti-theft lock?

Understand that it is not so easy for B-class locks. In other words, the more complex the cylinder, the longer it will take to unlock. Most of the home security doors on the market are Class B locks.

Class B lock is currently a level of relatively high security factor, from the key is generally double-sided double-row bullet slot, in addition to a blade or curve next to it, such a lock cylinder design standard is to open more than 280 minutes, and skilled locksmiths also take a long time, unless we carry out destructive demolition can be opened. Therefore, it has a certain anti-theft effect from Class B.

Second, the difference between Class B anti-theft lock cylinder and Class C lock cylinder

Anti-theft door lock cylinder level: The anti-theft door lock cylinder used on 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 Mechanical Lock Standard", the anti-theft door lock cylinder has two levels, A and B, and the super B level is an enhanced version of the B level developed by the entrepreneur.

It is generally believed that the current A-level anti-theft lock key on the market mainly includes a word key and a cross key. The internal structure of the A-grade lock cylinder is very simple, limited to the variation of the pin, and the pinball groove is few and shallow. The anti-technical opening time is within 1 minute, and the mutual opening rate is extremely high.

The marble structure is a single row of marbles or cross locks.

Class B Lock: The B-level lock key is a flat key, with a double row of bullet slots, which is different from the A-level lock in that there is an extra row of curved and irregular lines on the key surface. There are 3 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 the help of a strong twist tool, the lock cylinder can be opened in less than 1 minute.

Class C Lock: C-level locks are also called super B-level locks, the key shape is a single-sided blade inner milling groove or external milling groove key, and the lock cylinder type is a side post lock cylinder; After 270 minutes of detection, the technology could not be opened, and the inter-opening rate of the area was zero (1 in 16 million). The bullet structure is a double-row blade with V-shaped side post locking; If the lock cylinder is opened with a strong twist tool, the inside of the lock cylinder will be damaged, and it will self-detonate and lock, resulting in the inability to open.

The difference between B-level lock cylinder and C-level lock cylinder, the above is to introduce you to the B-level lock cylinder and the C-level lock cylinder special and each other's differences, of course, each lock has its own characteristics, the right choice of the right lock cost-effective dish, this depends on how the user chooses, it is best to give you a suggestion, because we are used to pushing the door directly, in fact, this is not good for the life of the door, or try to use the handle to rotate the door to open and close, so that it is not easy to collide, is a better habit.

The lock cylinder of the anti-theft door is divided into three grades: A, B, C, A, ordinary, B, medium, C, and currently better

It is the lock cylinder level, the anti-theft level, and the C grade is better than the B grade.