Ground Machined Worm Bore Diameter 12 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Face Width 32 mm Finish Black Oxide Gear Shape W1 Hub Diameter 25 mm Hub Projection 14 mm Material Carbon Steel Maximum Teeth Hardness 194 HB Metric Module Pitch 2 Number of Starts 2 Outside Diameter 35 mm Overall Length 46 mm Pitch Diameter 31 mm