... 300-550PP,PA,ABS+ ferrous powdersulphuric powderceramic powder400-600Functional machine pelletsPP,PA,ABS,PBT, etc+ anti-burning agent ... fog-preventing dipperstabilizerdual-prevention machine pellets250-350PE,EVA=ABS etc+ carbon blackblack machine pellets220-320Colored machine pelletsPE,PP,ABS,AS, ... shaft is made of 40CrNiMoA, and the screw thread components connect with the core shaft in an involute ...