ST12 ne ainihin talakawa sanyi birgima karfe, ST12 nasa ne da Jamus misali (DIN1623), daidai da EN10130 DC01, JS SPCC, da American misali ASTM A1008 CS.ST12 ne talakawa sanyi birgima karfe, ST13 stamping sa sanyi yi birgima karfe, ST14 ne zurfin birgima karfe. zane sa sanyi birgima karfe, ST12 aka bayyana a matsayin talakawa karfe lambar, da kuma q195, spcc, DC01 sa abu ne m guda.