... exporting experience2.Specification:1/2"-40"3.Flange Process:Forging Flange, Machining Flange, Cast Iron Flange4.Standard: DIN2533, DIN 2573, DIN2631, DIN2633,JIS B2220 ... :SOP, SOH, BL, PL, WN, SO etc.The flange standard: 1.JIS Standard: JIS B 2220, JIS 2216, JIS 7805, JIS B ... 16.5.4.JPI Standard: JPI 7S-15-84.5.API Standard: API6056.Nonstandard FlangesThe flange types:1.JIS Standard: SOP, SOH, BL, ...