... , g screwed half couplingBS Standard Electric Steel Female Screwed Half Coupling screwed half couplingMaterialCarbon steel, Stainless steel, Alloy and Malleable ironStandardANSI B1.20.1 ... gas, water ,oil and electricity connection etc. Materials: carbon steel ,stainless steel ,alloy steel . Surface of screwed half coupling: cold galvanizing,hot galvanizing ...