Yong’in eshigining yong’inga chidamliligi chegarasi o’rtasidagi farq: yong’in eshigi yong’inga qarshi eshikning yong’inga chidamliligi yaxlitligi, ya’ni yong’inga chidamlilik vaqti, joriy standart yong’inning oldini olish bo’lgan A, B, C ga bo’linadi. vaqt 1.5 soatdan kam emas, B sinf 1.0 soatdan kam emas, C sinf 0.6 soatdan kam emas.

qattiq yadroli yong’inga chidamli eshik ul,metall yong’inga qarshi eshik narxlari, bitta bargli yong’in eshigi,bitta yong’in eshigi,yong’inga chidamli metall eshiklar,yong’in eshigi,qattiq yadroli yong’inga chidamli eshik ul,laboratoriya uchun yong’inga chidamli eshik po’lati,yong’inga chidamli metall eshiklar,sertifikatlangan yong’in eshigi 3 soat 180 daqiqa,bitta yong’in eshigi,yong’inga chidamli po’lat eshik, ss kick plastinka bilan,yong’inga chidamli metall eshiklar,metall kirish yong’in tezligi eshigi,qattiq yadroli yong’inga chidamli eshik ul,tirgakli yong’inga chidamli eshik,bitta yong’in eshigi