... .size:1/2''-100' 4.standard: DIN, BS, USS, JIS 5.ISO certified TypesSlip-On, Welding Neck flange, Blind flange, Socket Welding ... , Screwed Boss Flange, etc. Applicable standard GB, ASME , ANSI, MSS ,JIS , DIN , EN, BS, and customers' drawings for special use;Material ...