The key, the lock, the learning security door should use the lock cylinder?
AB key lock, it has two keys A.B. It is a type of lock made up of bullets and other structures (the depth of the pit is different, the same as the difference in the depth of the flat key). There are also called "咔吧锁" and "computer locks, also called "bias lock" and "Bai Li lock". The role of the AB key is that when people install the lock, the owner can hand over the A key to the house decorator. For them to enter and exit the house door to unlock, so also called the A key as the "renovation key." When the decoration is completed, the owner does not need the decoration personnel to enter the room, the owner uses the B key to insert the lock hole and rotate the lock cylinder after a turn (circle) The A key loses the function of unlocking, so the B key is also called the “homeowner key.” The advantage of the AB key lock is that it can meet the needs of people to decorate the house, so as to avoid losing the door open key when the decoration is busy, or have a heart Poor people copying the door opening keys, etc., may avoid the insecurities caused by the owner after the decoration, and also avoid the trouble and cost brought by the lock after the decoration, so it is welcomed by people. The ABC lock cylinder or what is the super B-class lock core is just a gimmick. The anti-theft performance of the lock is divided into two grades according to the national standard. The main performance: such as the anti-destructive performance A-level requirement is not less than 15 minutes, the B-level requirement Do not 30 min; A technical opening performance level requirements of not less than 1 minute, class B is not less than 5 minutes; mutual opening rate not greater than ten thousandths Level A requirements, Class B is not greater than one ten thousandth to go.