twin conical screw barrel,bimetallic screw barrel,screw barrel Diameter: φ45/90-φ80/198 (according to the demands of customers) Length-diameter ratio: L/D=16-35 Conical dual-hole barrel screw specifications:φ25φ45-φ92φ188 (according to the demands of customers) The screw compressor can be designed according to different products and formulas Technology index:Nitriding layer depth: 0.5-0.8mm Nitriding layer hardness: 58-72 HRC