Ground Helical Gear Bore Diameter 12 mm Bore Diameter Tolerance H7 Face Width 12 mm Finish Black Oxide Gear Shape S1 Gear Type Helical Hub Diameter 32 mm Hub Projection 12 mm Material Alloy Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 1.5 Minimum Teeth Hardness 50 HRC Number of Teeth 26 Outside Diameter 42 mm Overall Length 24 mm