防盜鎖的(de)(de)國家標準分為分“普(pu)通防護級別”和“高(gao)級防護級別”，前者(zhe)用字母(mu)“A”表示，后者(zhe)用字母(mu)“B”表示。市面上的(de)(de)所謂超B級和C級鎖是一些(xie)商家自(zi)己定義的(de)(de)，嚴格來說(shuo)應(ying)該算作B級鎖。

A級(ji)鎖芯(xin)(xin)是(shi)老式(shi)的(de)鎖芯(xin)(xin)，鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)是(shi)十字平板(ban)型(xing)(xing)或(huo)(huo)月牙型(xing)(xing)有(you)(you)凸形(xing)(xing)匙(chi)(chi)(chi)(chi)(chi)(chi)槽(cao)鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)，單(dan)(dan)(dan)面(mian)(mian)(mian)或(huo)(huo)雙(shuang)面(mian)(mian)(mian)有(you)(you)一排凹形(xing)(xing)匙(chi)(chi)(chi)(chi)(chi)(chi)槽(cao)，這類(lei)鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)小偷(tou)用錫紙可以(yi)在幾秒鐘(zhong)之(zhi)內(nei)(nei)就可以(yi)打開(kai)，如果你家還(huan)是(shi)用的(de)這種鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)趕緊換了(le)。A級(ji)鎖芯(xin)(xin)已經無法防(fang)住小偷(tou)了(le)。B級(ji)鎖芯(xin)(xin)，防(fang)止技術開(kai)鎖時間(jian)不少(shao)于5分(fen)鐘(zhong)，防(fang)止沖擊開(kai)啟(qi)時間(jian)不少(shao)于30分(fen)鐘(zhong)。B級(ji)鎖芯(xin)(xin)鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)為(wei)平板(ban)型(xing)(xing)或(huo)(huo)月牙型(xing)(xing)，B級(ji)鎖鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)比(bi)A級(ji)鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)要復雜(za)，鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)槽(cao)為(wei)單(dan)(dan)(dan)面(mian)(mian)(mian)或(huo)(huo)雙(shuang)面(mian)(mian)(mian)有(you)(you)兩排凹形(xing)(xing)或(huo)(huo)圓柱型(xing)(xing)多點凹形(xing)(xing)匙(chi)(chi)(chi)(chi)(chi)(chi)洞；超B級(ji)鎖芯(xin)(xin)鑰(yao)(yao)匙(chi)(chi)(chi)(chi)(chi)(chi)為(wei)平板(ban)型(xing)(xing)，匙(chi)(chi)(chi)(chi)(chi)(chi)槽(cao)為(wei)單(dan)(dan)(dan)面(mian)(mian)(mian)或(huo)(huo)者(zhe)雙(shuang)面(mian)(mian)(mian)有(you)(you)兩排凹形(xing)(xing)加S形(xing)(xing)，或(huo)(huo)內(nei)(nei)外(wai)雙(shuang)蛇型(xing)(xing)內(nei)(nei)銑槽(cao)結構(gou)。是(shi)最(zui)復雜(za)的(de)鎖芯(xin)(xin)，也是(shi)最(zui)安全的(de)鎖芯(xin)(xin)，工具(ju)開(kai)啟(qi)時間(jian)在270分(fen)鐘(zhong)以(yi)上甚至無法開(kai)啟(qi)。