1.347 stainless steel flange 2.Size:1/2"-100",SCH5-160 ... ~2637,DIN 2641~2642· Japan:JIS B2220-2004,JIS F7806-1996,JIS B2291-1994· Shipbuilding:CB1001-81,CBM1013-81,CBM1018-81 ... die forging from round bar,CNC machining,Drilling and Passivating 347 stainless steel flange