... (1/2"-48) 2.Marerial:Q235,A105,ST37.2,20#,16Mn 3.Type:Flat, Slip-on,Bind ,Welding neck etc. LOOSE FLANGE1 ... neck flange (WNF), blind flange, orifice flange, reducing flange, pad type flange, loose hubbed flange, welding plate flange, welding neck collar ...