Yong’inga chidamliligiga ko’ra po’lat yong’in eshigi, yong’in ko’rsatkichlari A, B, C sinflariga bo’linadi. A sinfidagi temir yong’inga qarshi eshikning yong’inga chidamliligi 1.5 soatdan kam bo’lmasligi kerak, B sinfidagi temir yong’inga qarshi eshikning yong’inga chidamliligi vaqti 1.0 soatdan kam bo’lmasligi kerak va C sinfidagi po’lat yong’inga qarshi eshikning yong’inga chidamliligi vaqti bo’lmasligi kerak. 0.5 soatdan kam.

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