BOSTON GEAR ND24B Gear, Spur, 12 Pitch. More details: Spur Gear, 12 Pitch, Pitch Dia 2.000 In, Face Width 0.750 In, Number of Teeth 24, Bore Dia 0.625 In, Outside Dia 2.167 In, Overall Length 1.250 In, Hub Dia 1.64 In, Hub Projection 0.50 In, Pressure Angle 14 1/2 Deg, Keyway None, Setscrew Not Included, Steel Material