... Ctification Standards:ANSI,DIN,JIS,GB,BS special design available size:10~6000mm carbon steel square flangeSTANDARDS:. ANSI B16.5/MSS ... , API, JIS, JPI, DIN, UNI, BS, AS.JIS Weld NeckProduction size(NPS):10~6000mmType:Slip-On, Welding Neck flange, Blind flange ...