1)Standard:ANSI,DIN,JIS,BS,GB 2)Type:slip on,thread,socket weld,blind 3)Material:A105,A182,Q235, ... UNI,AS2129,EN1092,GB,HG,SH,SHJ,SGJ international standard.ANSI standard :ANSI b16.5,16.36,16.47,16.48 ... ,MSS SP44DIN standard: DIN2527,2566,2573,2641,2642,2638,2655 etc.JIS ... A182, Q235,A3,20#,16Mn,0Cr18Ni9,1Cr18Ni9Ti and so on.Type:SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf and So flange