... neck flange1.Best quality & price flange 2.Size:15~600mm 3.Standard: ... ISO 4.Can do special design ProductFlange ,Steel flange,Carbon steel,welding neck flangeSize15mm ~ 600mmMaterialCarbon steel(20 ... order.Product Description:High neck butt welding flange makes two pipes, fittings or equipments each fixed at ... a flange first, then put gasket in the middle of two flanges, fasten with bolts ...