Steel, ams6415 comp 4340; rockwell c scale 34 min, 38 max hardness; external splines, 49 teeth, 30 degrees pressure angle, 1.039 in. Min, 1.042 in. Max major od, 1.0208 in. Nom pitch dia, 0.175 in. Min, 0.180 in. Max lg splines; 0.350 in. Min, 0.360 in. Max o/a lg
