Cast iron; brinell 187/228 hardness; 2.161 in. Diameter bore; 2.980 in. Lg of bore; external involute 8 splines; 5.365 in. Major dia; 5.187 in. Minor dia; internal involute 26 splines; 2.660 in. Major dia; 2.520 in. Minor dia; 30 degrees pressure angle; 2.600 in. Pitch dia; 6 in. Od