1)Standard:ANSI,DIN,JIS,BS,GB 2)Type:slip on,thread,socket weld,blind 3)Material:A105 ... 3000LBS,6bar-250bar.According to ANSI/ASME,JIS,DIN,BS,UNI,AS2129,EN1092,GB,HG,SH,SHJ,SGJ international ... 2573,2641,2642,2638,2655 etc.JIS B22220 standardBS 4504 standardUNI standard: UNI 2276,2277,6083,2280,2283 ... Q235,A3,20#,16Mn,0Cr18Ni9,1Cr18Ni9Ti and so on.Type:SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf and So flange