ST12 ha e le hantle ke tšepe e rokotsoeng e batang, ST12 ke ea maemo a Jeremane (DIN1623), e lekanang le EN10130 DC01, JS SPCC, American standard ASTM A1008 CS.ST12 ke tšepe e pholileng e batang, ST13 e hatakela tšepe e kolobisitsoeng, ST14 e tebile. ho taka tšepe e kolobisitsoeng e batang, ST12 e hlahisoa e le nomoro e tloaelehileng ea tšepe, 'me q195, spcc, DC01 grade material ha e le hantle e tšoana.