Screws and barrels for injection molding machine Specifications:30g-25000g screws, can be matched with corresponded screw heads, distributors, barrels according to customer's requirement Depth of nitrated layer: 0.5-0.8mm Hardness of nitration:900-1020hv Fragility of nitration: less than grade 1 Surface roughness: ra 0.4um Surface hardness of nitrated cr coating layer:í²950hv Hardness of bimetallic layer: hrc55íp-72íp Thickness of cr-coating layer: 0.03-0.08mm Depth of bimetallic layer :ú+2mm