1)Standard:ANSI,DIN,JIS,BS,GB 2)Type:slip on,thread,socket weld,blind 3) ... to ANSI/ASME,JIS,DIN,BS,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 B22220 ... standardBS 4504 standardUNI standard: UNI 2276,2277,6083,2280,2283 and so onGB ...