... 3:ISO9001 SKD61 Single Extruder Screw And Barrel for R-PVC For good plasticizing effect,we have different designs ... . Product Parameter ProductSKD61 Single Extruder Screw And Barrel for R-PVCHardness after hardening and tempering HB260 °~ Nitrided Hardness HV950 ... type,three-head type,multi head type etc. Specification: Raw Material:The finished product processing requirements:38CrMoAlA,SACM645,42CrMo ...