Cres 410 ams5613; sprocket 0.375 in. Pitch, 9 teeth, 1.270 in. Od, 1.0964 in. Pd; external splines each 14 teeth, 36/64 pitch, 30 degrees pressure angle, 0.438 in. Pitch dia, 0.383 in. Minor dia, 0.469 in. Major dia, 0.355-24unf-3a two places; passivated o/a; splines both ends