ST12 Ko mau noa matao takaia maitai, ST12 no ki te paerewa Tiamana (DIN1623), ōrite ki EN10130 DC01, JS SPCC, te American paerewa ASTM A1008 CS.ST12 he maitai matao hurihia noa, ST13 panekuka kōeke matao hurihia maitai, ST14 he hohonu. te tuhi i te karaehe matao o te rino hurihuri, ko te ST12 te mea he tau maitai noa, me te q195, spcc, DC01 he rite tonu te ahua.