Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard. Specifications: Threaded Flanges, TH Flanges Size: 1/2" to 60", DN 12mm to DN 1500mm view... Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250 Facing: RF / RTJ Material:view... Cabon steel: A105, A350 LF2 Stainless steel: A182 F304/F304L/F316/F316L/F321 Alloy steel: F11, F12 Packing: plywood case and plywood pallet Standards, Dimensions & Weight ASME/ANSI B16.5 Class 150 TH ASME/ANSI B16.5 Class 300 TH ASME/ANSI B16.5 Class 600 TH ASME/ANSI B16.5 Class 900 TH