Ground Machined Worm Bore Diameter Not Applicable Bore Diameter Tolerance Not Applicable Bore Type Not Applicable Face Width 20 mm Gear Shape W5 Hub Diameter Not Applicable Hub Projection Not Applicable Material Alloy Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 0.8 Minimum Teeth Hardness 50 HRC Number of Starts 1 Outside Diameter 13.6 mm Overall Length 85 mm Pitch Diameter 12 mm