... 's demand. Product Parameter: ProductBimetallic Single Screw Barrel For Injection Molding MachineHardness after hardening and temperingHB260°~ 320° Nitrided Hardness ... screw Gradual type,mutant type,wave type,barrier type,double screen type,shunt type,separation type,exhaust type,pin ... type,mixed type,double-head type,three-head type,multi head type etc. ...