... .26 years exporting experience2.Specification:1/2"-40"3.Flange Process:Forging Flange, Machining Flange, Cast Iron Flange4.Standard: DIN2533, DIN 2573, DIN2631 ... , BL.3.ANSI Standard: SO, WN, SW, Threaded, Lap Joint, Ring Joint.4.JPI Standard: SO, WN, SW, Threaded, Lap Joint ... , Ring Joint.5.Nonstandard FlangesThe certificate of the flanges.Because we ...