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Flange Smooth Internal(External) Surface, Smallest Error Outer(Inner) Diameter, Even wall thickness, Satisfactory Machanical Property. STANDARD: DIN, J PL, WN, LJ, SO THR BL, JIS 5K-64K BL, SOP, SOH(A,B,C), LJ, WN ASME B16.5 SO S WN BL LJ THR, ASME B16.47 SERIES A WN BL ASME B16.47 SERIES B WN BL MSS SP44 WN BL API 605 WN BL AWWA C207 SO BL BS4504 SEC 3.1/1989, BS10/1969 UNI STANDARD PL WN LJ SO THR BL. TYPE: Welding neck Flange Loose Plate/Lap Joint Flange Blind Flange Threaded Flange Welding Neck Collar Flange Slip-on flange Weld-On Plate Collar Flange or According To Your Size Requriements to Be Based on Your Drawing If Need More Details, Please Check The Standard Each Size. Material: We Can Do As The FLANGE Material Standard Requirements. Or Others, Like The Follow, 1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4571, ST37.0, ST35.8, ST45.80, S235JR, P235GH, P265GH. C22.8, Rst37.2, A105, Q235, 304, 304I, 321, 316, 316L, 317L 310S, etc. Production art: Hot Forging, then Machining. Surface Treatment: Machining surface, then Oil or Painting. Oiled, painted, electrical and hot dipped galvanized are as per your choice. Flange marking: OVERWELL flanges, where the size and design permit, are marked with the following identification datas: LOGO(TUV), NOMINAL SIZE, PRESSURE CLASS, TYPE AND FACE, SPECIAL REQUIREMENTS, MATERIAL, HEAT CODE, INSPECTION MARK(TUV). Packing: Polywood Pallets, Wooden Pallets Or Other. Stock: We have huge different material type stock OUR NORMAL PACKING WAY AS FOLLOWING ENCLOSED FILE FOR YOUR CHECKING AND REFERENCE. OF COURSE, WE ALSO CAN DO AS YOUR REQUIREMENTS. Shandong Overwell Flange. Take Pride In Being One Of The China Flanges Professional Manufacturers & Exporters. Our Internaional Sales Agents Provide Feedback On Consumer Needs. Over 15Years Of Experience Of Exporting Has Given Us Market In Worldwide. We Can Provide Any Combination Of Specifications And Quantity. Our Management Style, With Attention To Detail, On Time Production, And The Very Best Prices Guarantees Your Complete Satisfaction. 97/23/EC,AD2000-MERKBLATT WO/TRD100 Is Our Manufacturing Principle. To Be Your Partners In Piping Line For Maintenance And Projects.