[origin supply] super c- level eccentric specifications complete lock cylinder blade anti-theft door mortise lock copper lock cylinder factory 【产地货源】超C级偏心规格齐全锁芯 叶片防盗门插锁 全铜锁芯厂

 National standards for anti-theft locks are divided into "ordinary protection level" and "high-level protection level", with the former indicated by the letter "A" and the latter by the letter "B". The so-called super B-level and C-level on the market are some businesses' own definitions, strictly speaking, they should be considered as B-level locks. 1. A-level lock core, preventing technical opening time not less than 1 minute, preventing destructive opening time not less than 15 minutes. A-level lock core is an old-style lock core, with keys in cross-plate or crescent moon shape with convex key grooves, with a single or double row of concave key grooves on one side or both sides. This type of key can be opened in a few seconds by thieves with tin foil. If you are still using this type of key, please change it immediately. A-level lock core is no longer able to prevent thieves. 2. B-level lock core, preventing technical opening time not less than 5 minutes, preventing impact opening time not less than 30 minutes. B-level lock core keys are flat or crescent moon shape, B-level lock keys are more complex than A-level keys, with key grooves on one side or both sides with two rows of concave or multiple concave holes in cylindrical shape.