防盜鎖(suo)的國家標準分為(wei)分“普通防護(hu)級別”和(he)“高級防護(hu)級別”，前者用字(zi)母“A”表(biao)示，后者用字(zi)母“B”表(biao)示。市面上的所謂超B級和(he)C級鎖(suo)是一(yi)些商家自(zi)己定義的，嚴(yan)格來說應該算(suan)作B級鎖(suo)。

A級(ji)(ji)鎖(suo)(suo)芯(xin)(xin)是(shi)(shi)老式(shi)的鎖(suo)(suo)芯(xin)(xin)，鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)是(shi)(shi)十字平(ping)(ping)板(ban)(ban)型(xing)(xing)或(huo)月牙型(xing)(xing)有凸形匙(chi)(chi)(chi)(chi)(chi)槽(cao)鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)，單(dan)面(mian)(mian)(mian)或(huo)雙(shuang)面(mian)(mian)(mian)有一(yi)排凹(ao)形匙(chi)(chi)(chi)(chi)(chi)槽(cao)，這類鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)小(xiao)偷用(yong)錫紙可(ke)以在(zai)幾秒鐘之內(nei)就可(ke)以打開(kai)(kai)，如(ru)果你家還是(shi)(shi)用(yong)的這種鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)趕緊換了。A級(ji)(ji)鎖(suo)(suo)芯(xin)(xin)已經無法(fa)防住小(xiao)偷了。B級(ji)(ji)鎖(suo)(suo)芯(xin)(xin)，防止技術開(kai)(kai)鎖(suo)(suo)時間(jian)(jian)不少(shao)于(yu)5分(fen)鐘，防止沖擊開(kai)(kai)啟(qi)時間(jian)(jian)不少(shao)于(yu)30分(fen)鐘。B級(ji)(ji)鎖(suo)(suo)芯(xin)(xin)鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)為(wei)平(ping)(ping)板(ban)(ban)型(xing)(xing)或(huo)月牙型(xing)(xing)，B級(ji)(ji)鎖(suo)(suo)鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)比A級(ji)(ji)鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)要復雜，鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)槽(cao)為(wei)單(dan)面(mian)(mian)(mian)或(huo)雙(shuang)面(mian)(mian)(mian)有兩(liang)排凹(ao)形或(huo)圓柱型(xing)(xing)多(duo)點(dian)凹(ao)形匙(chi)(chi)(chi)(chi)(chi)洞(dong)；超B級(ji)(ji)鎖(suo)(suo)芯(xin)(xin)鑰(yao)(yao)(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)為(wei)平(ping)(ping)板(ban)(ban)型(xing)(xing)，匙(chi)(chi)(chi)(chi)(chi)槽(cao)為(wei)單(dan)面(mian)(mian)(mian)或(huo)者雙(shuang)面(mian)(mian)(mian)有兩(liang)排凹(ao)形加S形，或(huo)內(nei)外(wai)雙(shuang)蛇型(xing)(xing)內(nei)銑槽(cao)結構。是(shi)(shi)最復雜的鎖(suo)(suo)芯(xin)(xin)，也是(shi)(shi)最安全的鎖(suo)(suo)芯(xin)(xin)，工具(ju)開(kai)(kai)啟(qi)時間(jian)(jian)在(zai)270分(fen)鐘以上甚至無法(fa)開(kai)(kai)啟(qi)。