... .Can do special design ProductFlange ,Steel flange,Carbon steel, threaded flangeSize15mm~600mmMaterialCarbon steel(20#,35#,45# etc),Stainless steel,Alloy steel,etcTypethreaded flange (screwed flange ... type sealing surface.Plate-type threaded flange bore thread processing, steel screw should be made after the end near, but not beyond ...