Detailed Product DescriptionNominal pitch circle diameter:1 80mm β5°α20°Normal moduleNumber of teethOutside DiameterHole D)ameter 1.25 149.25 115 1.5 178.66 1.75 100 181.73 2 83 171.72 2.25 73 170.52 2.5 67 174.32 2.75 61 175.13 3 167.31 53 63,5 3.25 181.95 3.5 47 175.73 3.75 43 174.01 4 41 177.73 4.5 37 182.14 5 31 173.49 5.5 29 179.71 6 27 184.32