Injection screw&barrel parts screw head, nozzle, rings for injection screw&barrel Injection screw&barrel partsscrew head, nozzle, rings for injection screw&barrelTECHNICAL DATA Material: 38CrMoALA /SKD61Depth of nitration ... (HRc56°-65°) Roughness of the surface:Ra 0.4μm Screw straightness: 0.015mm/m Chrome plating thickness: 0.01-0 ... plastic material: PP,PE,ABS,AS,PS etc. Accessory for screw&barrel