301 Full Hard wani bakin karfe ne na austenitic wanda ya bambanta da sauran nau'ikan nau'ikan 301 da United Performance Metals ke bayarwa saboda an yi sanyi birgima zuwa cikakkiyar yanayinsa.… A cikin cikakkiyar yanayinsa mai wuya, nau'in 301 yana da ƙarfin juzu'i na 185,000 PSI mafi ƙanƙanta, da ƙaramin ƙarfin amfanin gona na 140,000 PSI.