... alloy steel 2Good customer service 3Processed to drawing or buyer' Bimetallic conical twin screw barrel Specification:35/76, 45/90, 45/100, 50/105, 51 ... /132, 68/143, 70/135,70/140, 75/150, 80/143, 80/156, 92/188, 95/191, 105/191, 100/200The above ... : 850-960HV3) Surface Roughness: Ra≤0.8um4) Screw Straightness: 0.015mm5) Bimetallic Hardness: HRC50-626) Bimetallic Depth: 1.5-2.0mmBARREL1) Nitride Depth ...