STEEL SPEC. S-632-2 C1070 OR C1018;HARDNESS ROCKWELL C40-C50;8.995/9.005 IN. OD;6.242/6.252 IN. ID;0.103/0.105 IN. THK;INTERNAL SPLINES 64 TEETH DIAMETRAL PITCH 10;PRESSURE ANGLE 14.5 DEG;6.400 IN. PITCH DIA;6.687 IN. MAJOR DIA;6.196 IN. BASE CIRCLE DIA