2cres ams 5610 or aisi 416; rockwell c hardness 30-46; 2.317 in. Min, 2.327 in. Max lg; 1.560 in. Od flange; 0.5000 in. Min 0.5005 in. Max bore id; gear data, 23 teeth, 30 degrees pressure angle, 0.7188 in. Pitch dia, 0.7500 in. Max od, 32/64 diametral pitch