Single Screw and barrel for Injection Moulding Machine Nitride hardness HV850 â?? 1000 Screw diameter Range Φ20~Φ300mm Max. Barrel Inner Bore Diameter 500mm Nitride case depth 0.45 - 0.7mm Screw bimetallic depth 0.8-1.2mm Barrel bimetallic depth HRC 58-60