Screw Gear Bore Diameter 20 mm Bore Diameter Tolerance H7 Bore Type Plain Face Width 25 mm Gear Shape S1 Gear Type Screw Hub Diameter 60 mm Hub Projection 18 mm Material Stainless Steel Maximum Teeth Hardness 187 HB Metric Module Pitch 3 Number of Teeth 20 Outside Diameter 90.85 mm Overall Length 43 mm