Ground Helical Gear Bore Diameter 18 mm Bore Diameter Tolerance H7 Face Width 16 mm Finish Black Oxide Gear Shape S1 Gear Type Helical Hub Diameter 50 mm Hub Projection 13 mm Material Alloy Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 2 Minimum Teeth Hardness 50 HRC Number of Teeth 35 Outside Diameter 74 mm Overall Length 29 mm