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Spare Parts CNC Machining Gears , Low Speed Cutting Cross Screw Helical Spiral Gears 1. The main technical characteristics of this product: 1) For industries of Cement,Thermol Power etc. 2) Surface Hardness: HRC58-62 3) outside diameter can up to 8000 mm with unlimited modules 4) Accuracy: can up to DIN5 according to your requirements 5) Material: 17CrNiMo6 or 20CrMnTi ( Or per your requirements) 6) We can process perfectly according to your drawing or samples 7) Processed by