ST12 dhab ahaantii birta qabow ee caadiga ah, ST12 waxaa iska leh heerka Jarmalka (DIN1623), oo u dhiganta EN10130 DC01, JS SPCC, ASTM A1008 CS.ST12 American Standard sawirida darajada birta duuban ee qabow, ST12 waxaa lagu muujiyay nambarka birta caadiga ah, iyo q195, spcc, DC01 walxaha asal ahaan waa isku mid.