Ground Helical Gear Bore Diameter 8 mm Bore Diameter Tolerance H7 Face Width 8 mm Finish Black Oxide Gear Shape S1 Gear Type Helical Hub Diameter 18 mm Hub Projection 10 mm Material Alloy Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 1 Minimum Teeth Hardness 50 HRC Number of Teeth 22 Outside Diameter 24 mm Overall Length 18 mm