1)Standard:ANSI,DIN,JIS,BS,GB 2)Type:slip on,thread,socket weld,blind 3)Material:A105,A182,Q235,A3 ... ,6bar-250bar.According to ANSI/ASME,JIS,DIN,BS,UNI,AS2129,EN1092,GB,HG,SH,SHJ,SGJ international ... 4504 standardUNI standard: UNI 2276,2277,6083,2280,2283 and so onGB standard : GB,HG,SH,SHJ,SGJMaterial: ... , A182, Q235,A3,20#,16Mn,0Cr18Ni9,1Cr18Ni9Ti and so on.Type:SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf ...