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The anti-theft lock is divided into"general protection level"and"protection level",the former is represented by the letter"A"and the latter by the letter"B".The so-called super-B and C-class locks on the market are defined by some merchants,and strictly speaking,they should be counted as B-level locks.
1.Class A lock cylinder prevents technical unlocking time of not less than 1 minute and prevents destructive opening time of not less than 15 minutes.
The A-class lock cylinder is an old-fashioned lock cylinder.The key is a cross-plate type or a crescent-shaped convex keyway key.There is a row of concave keyfobs on one or both sides.This type of key thief can use tin foil in a few seconds.It can be opened,if the key that you still use at home is changed quickly.The A-class lock cylinder is no longer able to guard against thieves.
2.Class B lock cylinder prevents the technical unlocking time from being less than 5 minutes and preventing the impact opening time from being less than 30 minutes.
The B-class lock key is flat or crescent type.The B-class lock key is more complicated than the A-class key.The key slot has two rows of concave or cylindrical multi-point concave keyholes on one or both sides.
3.Super B-class lock cylinder,technology open time exceeds 270 minutes.
The super B-class lock core key is a flat type,the key groove is single-sided or double-sided with two rows of concave and S-shaped,or inner and outer double serpentine inner milling groove structure.It is a complex lock cylinder and a safe lock cylinder.It can't be opened when the tool is turned on for more than 270 minutes.
classification
Class A:The key is a flat or crescent type,with a row of concave keyfobs on one or both sides or a convex keyway on the four sides of the cross;
Class B:The key is flat or crescent-shaped,with two rows of concave keyfoils or cylindrical multi-point concave keyholes on one or both sides;
Super B grade:The key is flat,with two rows of concave and S-shaped keyways on one or both sides,or double-snake keyway inside and outside.
