Spur Gear Metric Module Pitch 1 Bore Diameter 8 mm Bore Type Plain Hub Type Hub with Set Screws Hub Diameter 22 mm Hub Projection 10 mm Face Width 10 mm Pitch Diameter 28 mm Finish Black Oxide Material Carbon Steel Pressure Angle 20 Degrees Bore Diameter Tolerance H7 Gear Shape S1 Includes Set Screw