rubber tube cylinder tipped screws /bushing screw

Specifications 1.rubber tube cylinder tipped screws /bushing screw 2.Cold /hot feed,pin screw . 3.Wear-abrasion&corrosion performance. Details: 1.Cool feeding rubber screw and barrel Specification: Φ40-Φ300mm, L/D:8-20:1 2.Hot feeding rubber screw and barrel Specification: Φ30-Φ250mm, L/D:4-8:1 3.Pin rubber screw and barrel Specification: Φ60-Φ250mm, L/D:12-18:1     Technical Data: Nitride Case Depth 0.5mm-0.8mm Nitride Hardness 950-1020HV Nitride Brittleness ≤Grade One Surface Roughness Ra0.4um Screw Straightness 0.015mm Alloy Hardness HRC65 Alloy Depth 1.2mm-2.0mm Chromium Coating Thickness   0.03~0.10mm      manufacturers of   rubber tube cylinder tipped screws /bushing screw