Worm Gear Bore Diameter 5 mm Bore Diameter Tolerance +/- 0.1 mm Bore Type Plain Face Width 10 mm Gear Shape W2 Material Stainless Steel Maximum Teeth Hardness 187 HB Metric Module Pitch 0.5 Number of Set Screws 1 Number of Starts 1 Outside Diameter 12 mm Overall Length 18 mm Pitch Diameter 11 mm